diff --git a/app/assets/javascripts/boards/components/board_column.vue b/app/assets/javascripts/boards/components/board_column.vue
index dae24338e45..23e4edea40f 100644
--- a/app/assets/javascripts/boards/components/board_column.vue
+++ b/app/assets/javascripts/boards/components/board_column.vue
@@ -1,9 +1,11 @@
 <script>
+import { mapGetters, mapActions } from 'vuex';
 import Sortable from 'sortablejs';
 import isWipLimitsOn from 'ee_else_ce/boards/mixins/is_wip_limits';
 import BoardListHeader from 'ee_else_ce/boards/components/board_list_header.vue';
 import Tooltip from '~/vue_shared/directives/tooltip';
 import EmptyComponent from '~/vue_shared/components/empty_component';
+import glFeatureFlagMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 import BoardBlankState from './board_blank_state.vue';
 import BoardList from './board_list.vue';
 import boardsStore from '../stores/boards_store';
@@ -21,7 +23,7 @@ export default {
   directives: {
     Tooltip,
   },
-  mixins: [isWipLimitsOn],
+  mixins: [isWipLimitsOn, glFeatureFlagMixin()],
   props: {
     list: {
       type: Object,
@@ -62,6 +64,7 @@ export default {
     };
   },
   computed: {
+    ...mapGetters(['getIssues']),
     showBoardListAndBoardInfo() {
       return this.list.type !== ListType.blank && this.list.type !== ListType.promotion;
     },
@@ -69,19 +72,36 @@ export default {
       // eslint-disable-next-line @gitlab/require-i18n-strings
       return `boards.${this.boardId}.${this.list.type}.${this.list.id}`;
     },
+    listIssues() {
+      if (!this.glFeatures.graphqlBoardLists) {
+        return this.list.issues;
+      }
+      return this.getIssues(this.list.id);
+    },
+    shouldFetchIssues() {
+      return this.glFeatures.graphqlBoardLists && this.list.type !== ListType.blank;
+    },
   },
   watch: {
     filter: {
       handler() {
-        this.list.page = 1;
-        this.list.getIssues(true).catch(() => {
-          // TODO: handle request error
-        });
+        if (this.shouldFetchIssues) {
+          this.fetchIssuesForList(this.list.id);
+        } else {
+          this.list.page = 1;
+          this.list.getIssues(true).catch(() => {
+            // TODO: handle request error
+          });
+        }
       },
       deep: true,
     },
   },
   mounted() {
+    if (this.shouldFetchIssues) {
+      this.fetchIssuesForList(this.list.id);
+    }
+
     const instance = this;
 
     const sortableOptions = getBoardSortableDefaultOptions({
@@ -108,6 +128,7 @@ export default {
     Sortable.create(this.$el.parentNode, sortableOptions);
   },
   methods: {
+    ...mapActions(['fetchIssuesForList']),
     showListNewIssueForm(listId) {
       eventHub.$emit('showForm', listId);
     },
@@ -142,7 +163,7 @@ export default {
         :disabled="disabled"
         :group-id="groupId || null"
         :issue-link-base="issueLinkBase"
-        :issues="list.issues"
+        :issues="listIssues"
         :list="list"
         :loading="list.loading"
         :root-path="rootPath"
diff --git a/app/assets/javascripts/boards/components/board_list.vue b/app/assets/javascripts/boards/components/board_list.vue
index 1a26782f6f0..6b19f7f3353 100644
--- a/app/assets/javascripts/boards/components/board_list.vue
+++ b/app/assets/javascripts/boards/components/board_list.vue
@@ -6,6 +6,7 @@ import boardCard from './board_card.vue';
 import eventHub from '../eventhub';
 import boardsStore from '../stores/boards_store';
 import { sprintf, __ } from '~/locale';
+import glFeatureFlagMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 import { deprecatedCreateFlash as createFlash } from '~/flash';
 import {
   getBoardSortableDefaultOptions,
@@ -24,6 +25,7 @@ export default {
     boardNewIssue,
     GlLoadingIcon,
   },
+  mixins: [glFeatureFlagMixin()],
   props: {
     groupId: {
       type: Number,
@@ -83,6 +85,7 @@ export default {
       deep: true,
     },
     issues() {
+      if (this.glFeatures.graphqlBoardLists) return;
       this.$nextTick(() => {
         if (
           this.scrollHeight() <= this.listHeight() &&
@@ -413,6 +416,8 @@ export default {
       this.showIssueForm = !this.showIssueForm;
     },
     onScroll() {
+      if (this.glFeatures.graphqlBoardLists) return;
+
       if (!this.list.loadingMore && this.scrollTop() > this.scrollHeight() - this.scrollOffset) {
         this.loadNextPage();
       }
diff --git a/app/assets/javascripts/boards/components/board_list_header.vue b/app/assets/javascripts/boards/components/board_list_header.vue
index c6c996a0074..0f27961cb3f 100644
--- a/app/assets/javascripts/boards/components/board_list_header.vue
+++ b/app/assets/javascripts/boards/components/board_list_header.vue
@@ -129,6 +129,9 @@ export default {
     collapsedTooltipTitle() {
       return this.listTitle || this.listAssignee;
     },
+    shouldDisplaySwimlanes() {
+      return this.glFeatures.boardsWithSwimlanes && this.isSwimlanesOn;
+    },
   },
   methods: {
     ...mapActions(['updateList']),
@@ -158,7 +161,7 @@ export default {
       }
     },
     updateListFunction() {
-      if (this.glFeatures.boardsWithSwimlanes && this.isSwimlanesHeader) {
+      if (this.shouldDisplaySwimlanes || this.glFeatures.graphqlBoardLists) {
         this.updateList({ listId: this.list.id, collapsed: !this.list.isExpanded });
       } else {
         this.list.update();
@@ -184,7 +187,7 @@ export default {
     <h3
       :class="{
         'user-can-drag': !disabled && !list.preset,
-        'gl-py-3': !list.isExpanded && !isSwimlanesHeader,
+        'gl-py-3 gl-h-full': !list.isExpanded && !isSwimlanesHeader,
         'gl-border-b-0': !list.isExpanded || isSwimlanesHeader,
         'gl-py-2': !list.isExpanded && isSwimlanesHeader,
       }"
diff --git a/app/assets/javascripts/boards/components/board_new_issue.vue b/app/assets/javascripts/boards/components/board_new_issue.vue
index 2817f9cb13d..924874d4dd2 100644
--- a/app/assets/javascripts/boards/components/board_new_issue.vue
+++ b/app/assets/javascripts/boards/components/board_new_issue.vue
@@ -42,6 +42,9 @@ export default {
       }
       return this.title === '';
     },
+    shouldDisplaySwimlanes() {
+      return this.glFeatures.boardsWithSwimlanes && this.isSwimlanesOn;
+    },
   },
   mounted() {
     this.$refs.input.focus();
@@ -75,7 +78,7 @@ export default {
       eventHub.$emit(`scroll-board-list-${this.list.id}`);
       this.cancel();
 
-      if (this.glFeatures.boardsWithSwimlanes && this.isSwimlanesOn) {
+      if (this.shouldDisplaySwimlanes || this.glFeatures.graphqlBoardLists) {
         this.addListIssue({ list: this.list, issue, position: 0 });
       }
 
@@ -85,7 +88,7 @@ export default {
           // Need this because our jQuery very kindly disables buttons on ALL form submissions
           $(this.$refs.submitButton).enable();
 
-          if (!this.glFeatures.boardsWithSwimlanes || !this.isSwimlanesOn) {
+          if (!this.shouldDisplaySwimlanes && !this.glFeatures.graphqlBoardLists) {
             boardsStore.setIssueDetail(issue);
             boardsStore.setListDetail(this.list);
           }
@@ -95,7 +98,7 @@ export default {
           $(this.$refs.submitButton).enable();
 
           // Remove the issue
-          if (this.glFeatures.boardsWithSwimlanes && this.isSwimlanesOn) {
+          if (this.shouldDisplaySwimlanes || this.glFeatures.graphqlBoardLists) {
             this.addListIssueFailure({ list: this.list, issue });
           } else {
             this.list.removeIssue(issue);
diff --git a/app/assets/javascripts/boards/components/issuable_title.vue b/app/assets/javascripts/boards/components/issuable_title.vue
new file mode 100644
index 00000000000..40627a9fab8
--- /dev/null
+++ b/app/assets/javascripts/boards/components/issuable_title.vue
@@ -0,0 +1,21 @@
+<script>
+export default {
+  props: {
+    title: {
+      type: String,
+      required: true,
+    },
+    refPath: {
+      type: String,
+      required: true,
+    },
+  },
+};
+</script>
+
+<template>
+  <div data-testid="issue-title">
+    <p class="gl-font-weight-bold">{{ title }}</p>
+    <p class="gl-mb-0">{{ refPath }}</p>
+  </div>
+</template>
diff --git a/app/assets/javascripts/boards/filtered_search_boards.js b/app/assets/javascripts/boards/filtered_search_boards.js
index f421faeb52d..fff89832bf0 100644
--- a/app/assets/javascripts/boards/filtered_search_boards.js
+++ b/app/assets/javascripts/boards/filtered_search_boards.js
@@ -27,7 +27,7 @@ export default class FilteredSearchBoards extends FilteredSearchManager {
   updateObject(path) {
     this.store.path = path.substr(1);
 
-    if (gon.features.boardsWithSwimlanes) {
+    if (gon.features.boardsWithSwimlanes || gon.features.graphqlBoardLists) {
       boardsStore.updateFiltersUrl();
       boardsStore.performSearch();
     }
diff --git a/app/assets/javascripts/boards/queries/issue.fragment.graphql b/app/assets/javascripts/boards/queries/issue.fragment.graphql
index 21b52766190..4b429f875a6 100644
--- a/app/assets/javascripts/boards/queries/issue.fragment.graphql
+++ b/app/assets/javascripts/boards/queries/issue.fragment.graphql
@@ -7,15 +7,10 @@ fragment IssueNode on Issue {
   referencePath: reference(full: true)
   dueDate
   timeEstimate
-  weight
   confidential
   webUrl
   subscribed
-  blocked
   relativePosition
-  epic {
-    id
-  }
   assignees {
     nodes {
       ...User
diff --git a/app/assets/javascripts/boards/queries/lists_issues.query.graphql b/app/assets/javascripts/boards/queries/lists_issues.query.graphql
index a9fc99fd916..c66cdf68cf4 100644
--- a/app/assets/javascripts/boards/queries/lists_issues.query.graphql
+++ b/app/assets/javascripts/boards/queries/lists_issues.query.graphql
@@ -1,15 +1,16 @@
-#import "./issue.fragment.graphql"
+#import "ee_else_ce/boards/queries/issue.fragment.graphql"
 
 query ListIssues(
   $fullPath: ID!
   $boardId: ID!
+  $id: ID
   $filters: BoardIssueInput
   $isGroup: Boolean = false
   $isProject: Boolean = false
 ) {
   group(fullPath: $fullPath) @include(if: $isGroup) {
     board(id: $boardId) {
-      lists {
+      lists(id: $id) {
         nodes {
           id
           issues(filters: $filters) {
@@ -23,7 +24,7 @@ query ListIssues(
   }
   project(fullPath: $fullPath) @include(if: $isProject) {
     board(id: $boardId) {
-      lists {
+      lists(id: $id) {
         nodes {
           id
           issues(filters: $filters) {
diff --git a/app/assets/javascripts/boards/stores/actions.js b/app/assets/javascripts/boards/stores/actions.js
index f8767211abd..248e06ba264 100644
--- a/app/assets/javascripts/boards/stores/actions.js
+++ b/app/assets/javascripts/boards/stores/actions.js
@@ -79,10 +79,10 @@ export default {
         lists = lists.nodes.map(list =>
           boardStore.updateListPosition({
             ...list,
-            id: getIdFromGraphQLId(list.id),
+            doNotFetchIssues: true,
           }),
         );
-        commit(types.RECEIVE_LISTS, sortBy(lists, 'position'));
+        commit(types.RECEIVE_BOARD_LISTS_SUCCESS, sortBy(lists, 'position'));
         // Backlog list needs to be created if it doesn't exist
         if (!lists.find(l => l.type === ListType.backlog)) {
           dispatch('createList', { backlog: true });
@@ -113,7 +113,7 @@ export default {
           commit(types.CREATE_LIST_FAILURE);
         } else {
           const list = data.boardListCreate?.list;
-          dispatch('addList', { ...list, id: getIdFromGraphQLId(list.id) });
+          dispatch('addList', list);
         }
       })
       .catch(() => {
@@ -124,8 +124,8 @@ export default {
   addList: ({ state, commit }, list) => {
     const lists = state.boardLists;
     // Temporarily using positioning logic from boardStore
-    lists.push(boardStore.updateListPosition(list));
-    commit(types.RECEIVE_LISTS, sortBy(lists, 'position'));
+    lists.push(boardStore.updateListPosition({ ...list, doNotFetchIssues: true }));
+    commit(types.RECEIVE_BOARD_LISTS_SUCCESS, sortBy(lists, 'position'));
   },
 
   showWelcomeList: ({ state, dispatch }) => {
@@ -197,8 +197,33 @@ export default {
     notImplemented();
   },
 
-  fetchIssuesForList: () => {
-    notImplemented();
+  fetchIssuesForList: ({ state, commit }, listId) => {
+    const { endpoints, boardType, filterParams } = state;
+    const { fullPath, boardId } = endpoints;
+
+    const variables = {
+      fullPath,
+      boardId: fullBoardId(boardId),
+      id: listId,
+      filters: filterParams,
+      isGroup: boardType === BoardType.group,
+      isProject: boardType === BoardType.project,
+    };
+
+    return gqlClient
+      .query({
+        query: listsIssuesQuery,
+        context: {
+          isSingleRequest: true,
+        },
+        variables,
+      })
+      .then(({ data }) => {
+        const { lists } = data[boardType]?.board;
+        const listIssues = formatListIssues(lists);
+        commit(types.RECEIVE_ISSUES_FOR_LIST_SUCCESS, { listIssues, listId });
+      })
+      .catch(() => commit(types.RECEIVE_ISSUES_FOR_LIST_FAILURE, listId));
   },
 
   fetchIssuesForAllLists: ({ state, commit }) => {
diff --git a/app/assets/javascripts/boards/stores/boards_store.js b/app/assets/javascripts/boards/stores/boards_store.js
index 4fdbfbc36c5..faf4f9ebfd3 100644
--- a/app/assets/javascripts/boards/stores/boards_store.js
+++ b/app/assets/javascripts/boards/stores/boards_store.js
@@ -304,7 +304,11 @@ const boardsStore = {
   onNewListIssueResponse(list, issue, data) {
     issue.refreshData(data);
 
-    if (!gon.features.boardsWithSwimlanes && list.issuesSize > 1) {
+    if (
+      !gon.features.boardsWithSwimlanes &&
+      !gon.features.graphqlBoardLists &&
+      list.issues.length > 1
+    ) {
       const moveBeforeId = list.issues[1].id;
       this.moveIssue(issue.id, null, null, null, moveBeforeId);
     }
@@ -723,6 +727,10 @@ const boardsStore = {
   newListIssue(list, issue) {
     list.addIssue(issue, null, 0);
     list.issuesSize += 1;
+    let listId = list.id;
+    if (typeof listId === 'string') {
+      listId = getIdFromGraphQLId(listId);
+    }
 
     return this.newIssue(list.id, issue)
       .then(res => res.data)
diff --git a/app/assets/javascripts/boards/stores/getters.js b/app/assets/javascripts/boards/stores/getters.js
index 80acf8e66cc..3688476dc5f 100644
--- a/app/assets/javascripts/boards/stores/getters.js
+++ b/app/assets/javascripts/boards/stores/getters.js
@@ -14,6 +14,11 @@ export default {
     return state.issues[id] || {};
   },
 
+  getIssues: (state, getters) => listId => {
+    const listIssueIds = state.issuesByListId[listId] || [];
+    return listIssueIds.map(id => getters.getIssueById(id));
+  },
+
   getActiveIssue: state => {
     return state.issues[state.activeId] || {};
   },
diff --git a/app/assets/javascripts/boards/stores/mutation_types.js b/app/assets/javascripts/boards/stores/mutation_types.js
index 5a3d62dc703..f0a283f6161 100644
--- a/app/assets/javascripts/boards/stores/mutation_types.js
+++ b/app/assets/javascripts/boards/stores/mutation_types.js
@@ -2,7 +2,7 @@ export const SET_INITIAL_BOARD_DATA = 'SET_INITIAL_BOARD_DATA';
 export const SET_FILTERS = 'SET_FILTERS';
 export const CREATE_LIST_SUCCESS = 'CREATE_LIST_SUCCESS';
 export const CREATE_LIST_FAILURE = 'CREATE_LIST_FAILURE';
-export const RECEIVE_LISTS = 'RECEIVE_LISTS';
+export const RECEIVE_BOARD_LISTS_SUCCESS = 'RECEIVE_BOARD_LISTS_SUCCESS';
 export const SHOW_PROMOTION_LIST = 'SHOW_PROMOTION_LIST';
 export const REQUEST_ADD_LIST = 'REQUEST_ADD_LIST';
 export const RECEIVE_ADD_LIST_SUCCESS = 'RECEIVE_ADD_LIST_SUCCESS';
@@ -13,6 +13,8 @@ export const REQUEST_REMOVE_LIST = 'REQUEST_REMOVE_LIST';
 export const RECEIVE_REMOVE_LIST_SUCCESS = 'RECEIVE_REMOVE_LIST_SUCCESS';
 export const RECEIVE_REMOVE_LIST_ERROR = 'RECEIVE_REMOVE_LIST_ERROR';
 export const REQUEST_ISSUES_FOR_ALL_LISTS = 'REQUEST_ISSUES_FOR_ALL_LISTS';
+export const RECEIVE_ISSUES_FOR_LIST_FAILURE = 'RECEIVE_ISSUES_FOR_LIST_FAILURE';
+export const RECEIVE_ISSUES_FOR_LIST_SUCCESS = 'RECEIVE_ISSUES_FOR_LIST_SUCCESS';
 export const RECEIVE_ISSUES_FOR_ALL_LISTS_SUCCESS = 'RECEIVE_ISSUES_FOR_ALL_LISTS_SUCCESS';
 export const RECEIVE_ISSUES_FOR_ALL_LISTS_FAILURE = 'RECEIVE_ISSUES_FOR_ALL_LISTS_FAILURE';
 export const REQUEST_ADD_ISSUE = 'REQUEST_ADD_ISSUE';
diff --git a/app/assets/javascripts/boards/stores/mutations.js b/app/assets/javascripts/boards/stores/mutations.js
index a03c541ada5..faeb3e25a71 100644
--- a/app/assets/javascripts/boards/stores/mutations.js
+++ b/app/assets/javascripts/boards/stores/mutations.js
@@ -35,7 +35,7 @@ export default {
     state.showPromotion = showPromotion;
   },
 
-  [mutationTypes.RECEIVE_LISTS]: (state, lists) => {
+  [mutationTypes.RECEIVE_BOARD_LISTS_SUCCESS]: (state, lists) => {
     state.boardLists = lists;
   },
 
@@ -89,6 +89,20 @@ export default {
     notImplemented();
   },
 
+  [mutationTypes.RECEIVE_ISSUES_FOR_LIST_SUCCESS]: (state, { listIssues, listId }) => {
+    const { listData, issues } = listIssues;
+    Vue.set(state, 'issues', { ...state.issues, ...issues });
+    Vue.set(state.issuesByListId, listId, listData[listId]);
+    const listIndex = state.boardLists.findIndex(l => l.id === listId);
+    Vue.set(state.boardLists[listIndex], 'loading', false);
+  },
+
+  [mutationTypes.RECEIVE_ISSUES_FOR_LIST_FAILURE]: (state, listId) => {
+    state.error = __('An error occurred while fetching the board issues. Please reload the page.');
+    const listIndex = state.boardLists.findIndex(l => l.id === listId);
+    Vue.set(state.boardLists[listIndex], 'loading', false);
+  },
+
   [mutationTypes.REQUEST_ISSUES_FOR_ALL_LISTS]: state => {
     state.isLoadingIssues = true;
   },
diff --git a/app/assets/javascripts/diffs/components/diff_file.vue b/app/assets/javascripts/diffs/components/diff_file.vue
index c8b7168dce1..02396a4ba1b 100644
--- a/app/assets/javascripts/diffs/components/diff_file.vue
+++ b/app/assets/javascripts/diffs/components/diff_file.vue
@@ -1,32 +1,26 @@
 <script>
 import { mapActions, mapGetters, mapState } from 'vuex';
 import { escape } from 'lodash';
-import { GlButton, GlLoadingIcon, GlSafeHtmlDirective as SafeHtml } from '@gitlab/ui';
+import { GlLoadingIcon, GlSafeHtmlDirective as SafeHtml } from '@gitlab/ui';
 import glFeatureFlagsMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
-import { sprintf } from '~/locale';
+import { __, sprintf } from '~/locale';
 import { deprecatedCreateFlash as createFlash } from '~/flash';
 import { hasDiff } from '~/helpers/diffs_helper';
 import eventHub from '../../notes/event_hub';
 import DiffFileHeader from './diff_file_header.vue';
 import DiffContent from './diff_content.vue';
 import { diffViewerErrors } from '~/ide/constants';
-import { GENERIC_ERROR, DIFF_FILE } from '../i18n';
 
 export default {
   components: {
     DiffFileHeader,
     DiffContent,
-    GlButton,
     GlLoadingIcon,
   },
   directives: {
     SafeHtml,
   },
   mixins: [glFeatureFlagsMixin()],
-  i18n: {
-    genericError: GENERIC_ERROR,
-    ...DIFF_FILE,
-  },
   props: {
     file: {
       type: Object,
@@ -59,7 +53,7 @@ export default {
     ...mapGetters('diffs', ['getDiffFileDiscussions']),
     viewBlobLink() {
       return sprintf(
-        this.i18n.blobView,
+        __('You can %{linkStart}view the blob%{linkEnd} instead.'),
         {
           linkStart: `<a href="${escape(this.file.view_path)}">`,
           linkEnd: '</a>',
@@ -81,7 +75,9 @@ export default {
     },
     forkMessage() {
       return sprintf(
-        this.i18n.editInFork,
+        __(
+          "You're not allowed to %{tag_start}edit%{tag_end} files in this project directly. Please fork this project, make your changes there, and submit a merge request.",
+        ),
         {
           tag_start: '<span class="js-file-fork-suggestion-section-action">',
           tag_end: '</span>',
@@ -152,7 +148,7 @@ export default {
         })
         .catch(() => {
           this.isLoadingCollapsedDiff = false;
-          createFlash(this.i18n.genericError);
+          createFlash(__('Something went wrong on our end. Please try again!'));
         });
     },
     showForkMessage() {
@@ -192,14 +188,14 @@ export default {
       <a
         :href="file.fork_path"
         class="js-fork-suggestion-button btn btn-grouped btn-inverted btn-success"
-        >{{ $options.i18n.fork }}</a
+        >{{ __('Fork') }}</a
       >
       <button
         class="js-cancel-fork-suggestion-button btn btn-grouped"
         type="button"
         @click="hideForkMessage"
       >
-        {{ $options.i18n.cancel }}
+        {{ __('Cancel') }}
       </button>
     </div>
     <gl-loading-icon v-if="showLoadingIcon" class="diff-content loading" />
@@ -209,17 +205,11 @@ export default {
           <div v-safe-html="errorMessage" class="nothing-here-block"></div>
         </div>
         <template v-else>
-          <div v-show="isCollapsed" class="gl-p-7 gl-text-center collapsed-file-warning">
-            <p class="gl-mb-8 gl-mt-5">
-              {{ $options.i18n.collapsed }}
-            </p>
-            <gl-button
-              class="gl-alert-action gl-mb-5"
-              data-testid="expandButton"
-              @click="handleToggle"
-            >
-              {{ $options.i18n.expand }}
-            </gl-button>
+          <div v-show="isCollapsed" class="nothing-here-block diff-collapsed">
+            {{ __('This diff is collapsed.') }}
+            <a class="click-to-expand js-click-to-expand" href="#" @click.prevent="handleToggle">{{
+              __('Click to expand it.')
+            }}</a>
           </div>
           <diff-content
             v-show="!isCollapsed && !isFileTooLarge"
diff --git a/app/assets/javascripts/diffs/i18n.js b/app/assets/javascripts/diffs/i18n.js
deleted file mode 100644
index 8b91543587c..00000000000
--- a/app/assets/javascripts/diffs/i18n.js
+++ /dev/null
@@ -1,14 +0,0 @@
-import { __ } from '~/locale';
-
-export const GENERIC_ERROR = __('Something went wrong on our end. Please try again!');
-
-export const DIFF_FILE = {
-  blobView: __('You can %{linkStart}view the blob%{linkEnd} instead.'),
-  editInFork: __(
-    "You're not allowed to %{tag_start}edit%{tag_end} files in this project directly. Please fork this project, make your changes there, and submit a merge request.",
-  ),
-  fork: __('Fork'),
-  cancel: __('Cancel'),
-  collapsed: __('This file is collapsed.'),
-  expand: __('Expand file'),
-};
diff --git a/app/assets/stylesheets/pages/boards.scss b/app/assets/stylesheets/pages/boards.scss
index 7238ff6c77d..c4852974a4d 100644
--- a/app/assets/stylesheets/pages/boards.scss
+++ b/app/assets/stylesheets/pages/boards.scss
@@ -116,7 +116,6 @@
 
     .board-title {
       flex-direction: column;
-      height: 100%;
     }
 
     .board-title-caret {
diff --git a/app/views/registrations/welcome.html.haml b/app/views/registrations/welcome.html.haml
index bdde5de0f61..068ce70b9ea 100644
--- a/app/views/registrations/welcome.html.haml
+++ b/app/views/registrations/welcome.html.haml
@@ -23,4 +23,3 @@
               = render "registrations/welcome/button"
             - else
               = f.submit _('Get started!'), class: 'btn-register btn btn-block gl-mb-0 gl-p-3'
-
diff --git a/app/views/shared/boards/_show.html.haml b/app/views/shared/boards/_show.html.haml
index 7a4c495e177..86c73e36317 100644
--- a/app/views/shared/boards/_show.html.haml
+++ b/app/views/shared/boards/_show.html.haml
@@ -19,7 +19,7 @@
 #board-app.boards-app.position-relative{ "v-cloak" => "true", data: board_data, ":class" => "{ 'is-compact': detailIssueVisible }" }
   = render 'shared/issuable/search_bar', type: :boards, board: board
 
-  - if Feature.enabled?(:boards_with_swimlanes, current_board_parent)
+  - if Feature.enabled?(:boards_with_swimlanes, current_board_parent) || Feature.enabled?(:graphql_board_lists, current_board_parent)
     %board-content{ "v-cloak" => "true",
       "ref" => "board_content",
       ":lists" => "state.lists",
diff --git a/changelogs/unreleased/feature-highlight-collapsed-diff-files.yml b/changelogs/unreleased/feature-highlight-collapsed-diff-files.yml
deleted file mode 100644
index 9c066e1ffa3..00000000000
--- a/changelogs/unreleased/feature-highlight-collapsed-diff-files.yml
+++ /dev/null
@@ -1,5 +0,0 @@
----
-title: Expand the visible highlight for collapsed diffs
-merge_request: 41393
-author:
-type: other
diff --git a/doc/development/migration_style_guide.md b/doc/development/migration_style_guide.md
index 3cb04a59ed6..2a49005da1b 100644
--- a/doc/development/migration_style_guide.md
+++ b/doc/development/migration_style_guide.md
@@ -300,7 +300,7 @@ include Gitlab::Database::MigrationHelpers
 
 def up
   with_lock_retries do
-    add_foreign_key :imports, :projects, column: :project_id, on_delete: :cascade
+    add_foreign_key :imports, :projects, column: :project_id, on_delete: :cascade # rubocop:disable Migration/AddConcurrentForeignKey
   end
 end
 
@@ -318,7 +318,7 @@ include Gitlab::Database::MigrationHelpers
 
 def up
   with_lock_retries do
-    add_foreign_key :imports, :users, column: :user_id, on_delete: :cascade
+    add_foreign_key :imports, :users, column: :user_id, on_delete: :cascade # rubocop:disable Migration/AddConcurrentForeignKey
   end
 end
 
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index fe3915db883..668e833072b 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -10357,9 +10357,6 @@ msgstr ""
 msgid "Expand dropdown"
 msgstr ""
 
-msgid "Expand file"
-msgstr ""
-
 msgid "Expand milestones"
 msgstr ""
 
@@ -25733,9 +25730,6 @@ msgstr ""
 msgid "This field is required."
 msgstr ""
 
-msgid "This file is collapsed."
-msgstr ""
-
 msgid "This group"
 msgstr ""
 
diff --git a/spec/features/groups/board_sidebar_spec.rb b/spec/features/groups/board_sidebar_spec.rb
index 3bbeed10948..690d661ba2f 100644
--- a/spec/features/groups/board_sidebar_spec.rb
+++ b/spec/features/groups/board_sidebar_spec.rb
@@ -19,6 +19,8 @@ RSpec.describe 'Group Issue Boards', :js do
   let(:card)             { find('.board:nth-child(1)').first('.board-card') }
 
   before do
+    # stubbing until sidebar work is done: https://gitlab.com/gitlab-org/gitlab/-/issues/230711
+    stub_feature_flags(graphql_board_lists: false)
     sign_in(user)
 
     visit group_board_path(group, board)
diff --git a/spec/features/merge_request/user_expands_diff_spec.rb b/spec/features/merge_request/user_expands_diff_spec.rb
index b0cfa8d0d54..fc17ef011c2 100644
--- a/spec/features/merge_request/user_expands_diff_spec.rb
+++ b/spec/features/merge_request/user_expands_diff_spec.rb
@@ -17,11 +17,11 @@ RSpec.describe 'User expands diff', :js do
 
   it 'allows user to expand diff' do
     page.within find('[id="19763941ab80e8c09871c0a425f0560d9053bcb3"]') do
-      find('[data-testid="expandButton"]').click
+      click_link 'Click to expand it.'
 
       wait_for_requests
 
-      expect(page).not_to have_content('Expand File')
+      expect(page).not_to have_content('Click to expand it.')
       expect(page).to have_selector('.code')
     end
   end
diff --git a/spec/frontend/boards/components/issuable_title_spec.js b/spec/frontend/boards/components/issuable_title_spec.js
new file mode 100644
index 00000000000..4b7f491b998
--- /dev/null
+++ b/spec/frontend/boards/components/issuable_title_spec.js
@@ -0,0 +1,33 @@
+import { shallowMount } from '@vue/test-utils';
+import IssuableTitle from '~/boards/components/issuable_title.vue';
+
+describe('IssuableTitle', () => {
+  let wrapper;
+  const defaultProps = {
+    title: 'One',
+    refPath: 'path',
+  };
+  const createComponent = () => {
+    wrapper = shallowMount(IssuableTitle, {
+      propsData: { ...defaultProps },
+    });
+  };
+  const findIssueContent = () => wrapper.find('[data-testid="issue-title"]');
+
+  beforeEach(() => {
+    createComponent();
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+    wrapper = null;
+  });
+
+  it('renders a title of an issue in the sidebar', () => {
+    expect(findIssueContent().text()).toContain('One');
+  });
+
+  it('renders a referencePath of an issue in the sidebar', () => {
+    expect(findIssueContent().text()).toContain('path');
+  });
+});
diff --git a/spec/frontend/boards/mock_data.js b/spec/frontend/boards/mock_data.js
index 717ab5f3add..a84970eb736 100644
--- a/spec/frontend/boards/mock_data.js
+++ b/spec/frontend/boards/mock_data.js
@@ -98,12 +98,35 @@ export const mockMilestone = {
   due_date: '2019-12-31',
 };
 
+const assignees = [
+  {
+    id: 'gid://gitlab/User/2',
+    username: 'angelina.herman',
+    name: 'Bernardina Bosco',
+    avatar: 'https://www.gravatar.com/avatar/eb7b664b13a30ad9f9ba4b61d7075470?s=80&d=identicon',
+    webUrl: 'http://127.0.0.1:3000/angelina.herman',
+  },
+];
+
+const labels = [
+  {
+    id: 'gid://gitlab/GroupLabel/5',
+    title: 'Cosync',
+    color: '#34ebec',
+    description: null,
+  },
+];
+
 export const rawIssue = {
-  title: 'Testing',
-  id: 'gid://gitlab/Issue/1',
-  iid: 1,
+  title: 'Issue 1',
+  id: 'gid://gitlab/Issue/436',
+  iid: 27,
+  dueDate: null,
+  timeEstimate: 0,
+  weight: null,
   confidential: false,
-  referencePath: 'gitlab-org/gitlab-test#1',
+  referencePath: 'gitlab-org/gitlab-test#27',
+  path: '/gitlab-org/gitlab-test/-/issues/27',
   labels: {
     nodes: [
       {
@@ -115,23 +138,24 @@ export const rawIssue = {
     ],
   },
   assignees: {
-    nodes: [
-      {
-        id: 1,
-        name: 'name',
-        username: 'username',
-        avatar_url: 'http://avatar_url',
-      },
-    ],
+    nodes: assignees,
+  },
+  epic: {
+    id: 'gid://gitlab/Epic/41',
   },
 };
 
 export const mockIssue = {
-  title: 'Testing',
-  id: 1,
-  iid: 1,
+  id: 'gid://gitlab/Issue/436',
+  iid: 27,
+  title: 'Issue 1',
+  dueDate: null,
+  timeEstimate: 0,
+  weight: null,
   confidential: false,
-  referencePath: 'gitlab-org/gitlab-test#1',
+  referencePath: 'gitlab-org/gitlab-test#27',
+  path: '/gitlab-org/gitlab-test/-/issues/27',
+  assignees,
   labels: [
     {
       id: 1,
@@ -140,44 +164,64 @@ export const mockIssue = {
       description: 'testing',
     },
   ],
-  assignees: [
-    {
-      id: 1,
-      name: 'name',
-      username: 'username',
-      avatar_url: 'http://avatar_url',
-    },
-  ],
+  epic: {
+    id: 'gid://gitlab/Epic/41',
+  },
 };
 
 export const mockIssueWithModel = new ListIssue(mockIssue);
 
 export const mockIssue2 = {
-  title: 'Planning',
-  id: 2,
-  iid: 2,
+  id: 'gid://gitlab/Issue/437',
+  iid: 28,
+  title: 'Issue 2',
+  dueDate: null,
+  timeEstimate: 0,
+  weight: null,
   confidential: false,
   referencePath: 'gitlab-org/gitlab-test#2',
-  labels: [
-    {
-      id: 1,
-      title: 'plan',
-      color: 'blue',
-      description: 'planning',
-    },
-  ],
-  assignees: [
-    {
-      id: 1,
-      name: 'name',
-      username: 'username',
-      avatar_url: 'http://avatar_url',
-    },
-  ],
+  path: '/gitlab-org/gitlab-test/-/issues/28',
+  assignees,
+  labels,
+  epic: {
+    id: 'gid://gitlab/Epic/40',
+  },
 };
 
 export const mockIssue2WithModel = new ListIssue(mockIssue2);
 
+export const mockIssue3 = {
+  id: 'gid://gitlab/Issue/438',
+  iid: 29,
+  title: 'Issue 3',
+  referencePath: '#29',
+  dueDate: null,
+  timeEstimate: 0,
+  weight: null,
+  confidential: false,
+  path: '/gitlab-org/gitlab-test/-/issues/28',
+  assignees,
+  labels,
+  epic: null,
+};
+
+export const mockIssue4 = {
+  id: 'gid://gitlab/Issue/439',
+  iid: 30,
+  title: 'Issue 4',
+  referencePath: '#30',
+  dueDate: null,
+  timeEstimate: 0,
+  weight: null,
+  confidential: false,
+  path: '/gitlab-org/gitlab-test/-/issues/28',
+  assignees,
+  labels,
+  epic: null,
+};
+
+export const mockIssues = [mockIssue, mockIssue2];
+
 export const BoardsMockData = {
   GET: {
     '/test/-/boards/1/lists/300/issues?id=300&page=1': {
@@ -239,6 +283,7 @@ export const mockLists = [
     label: null,
     assignee: null,
     milestone: null,
+    loading: false,
   },
   {
     id: 'gid://gitlab/List/2',
@@ -255,9 +300,22 @@ export const mockLists = [
     },
     assignee: null,
     milestone: null,
+    loading: false,
   },
 ];
 
 export const mockListsWithModel = mockLists.map(listMock =>
   Vue.observable(new List({ ...listMock, doNotFetchIssues: true })),
 );
+
+export const mockIssuesByListId = {
+  'gid://gitlab/List/1': [mockIssue.id, mockIssue3.id, mockIssue4.id],
+  'gid://gitlab/List/2': mockIssues.map(({ id }) => id),
+};
+
+export const issues = {
+  [mockIssue.id]: mockIssue,
+  [mockIssue2.id]: mockIssue2,
+  [mockIssue3.id]: mockIssue3,
+  [mockIssue4.id]: mockIssue4,
+};
diff --git a/spec/frontend/boards/stores/actions_spec.js b/spec/frontend/boards/stores/actions_spec.js
index 4eb1a370a9f..8efad4d3ac7 100644
--- a/spec/frontend/boards/stores/actions_spec.js
+++ b/spec/frontend/boards/stores/actions_spec.js
@@ -3,7 +3,6 @@ import {
   mockListsWithModel,
   mockLists,
   mockIssue,
-  mockIssue2,
   mockIssueWithModel,
   mockIssue2WithModel,
   rawIssue,
@@ -134,7 +133,7 @@ describe('createList', () => {
       { backlog: true },
       state,
       [],
-      [{ type: 'addList', payload: { ...backlogList, id: 1 } }],
+      [{ type: 'addList', payload: backlogList }],
       done,
     );
   });
@@ -232,19 +231,15 @@ describe('deleteList', () => {
   expectNotImplemented(actions.deleteList);
 });
 
-describe('fetchIssuesForList', () => {
-  expectNotImplemented(actions.fetchIssuesForList);
-});
-
 describe('moveIssue', () => {
   const listIssues = {
-    'gid://gitlab/List/1': [mockIssue.id, mockIssue2.id],
+    'gid://gitlab/List/1': [436, 437],
     'gid://gitlab/List/2': [],
   };
 
   const issues = {
-    '1': mockIssueWithModel,
-    '2': mockIssue2WithModel,
+    '436': mockIssueWithModel,
+    '437': mockIssue2WithModel,
   };
 
   const state = {
@@ -269,7 +264,7 @@ describe('moveIssue', () => {
     testAction(
       actions.moveIssue,
       {
-        issueId: mockIssue.id,
+        issueId: '436',
         issueIid: mockIssue.iid,
         issuePath: mockIssue.referencePath,
         fromListId: 'gid://gitlab/List/1',
@@ -308,7 +303,7 @@ describe('moveIssue', () => {
     testAction(
       actions.moveIssue,
       {
-        issueId: mockIssue.id,
+        issueId: '436',
         issueIid: mockIssue.iid,
         issuePath: mockIssue.referencePath,
         fromListId: 'gid://gitlab/List/1',
diff --git a/spec/frontend/boards/stores/getters_spec.js b/spec/frontend/boards/stores/getters_spec.js
index 267451845ba..288143a0f21 100644
--- a/spec/frontend/boards/stores/getters_spec.js
+++ b/spec/frontend/boards/stores/getters_spec.js
@@ -1,5 +1,6 @@
 import getters from '~/boards/stores/getters';
 import { inactiveId } from '~/boards/constants';
+import { mockIssue, mockIssue2, mockIssues, mockIssuesByListId, issues } from '../mock_data';
 
 describe('Boards - Getters', () => {
   describe('getLabelToggleState', () => {
@@ -115,4 +116,18 @@ describe('Boards - Getters', () => {
       expect(getters.getActiveIssue(state)).toEqual(expected);
     });
   });
+
+  describe('getIssues', () => {
+    const boardsState = {
+      issuesByListId: mockIssuesByListId,
+      issues,
+    };
+    it('returns issues for a given listId', () => {
+      const getIssueById = issueId => [mockIssue, mockIssue2].find(({ id }) => id === issueId);
+
+      expect(getters.getIssues(boardsState, { getIssueById })('gid://gitlab/List/2')).toEqual(
+        mockIssues,
+      );
+    });
+  });
 });
diff --git a/spec/frontend/boards/stores/mutations_spec.js b/spec/frontend/boards/stores/mutations_spec.js
index 350eccfa82e..a13a99a507e 100644
--- a/spec/frontend/boards/stores/mutations_spec.js
+++ b/spec/frontend/boards/stores/mutations_spec.js
@@ -54,11 +54,11 @@ describe('Board Store Mutations', () => {
     });
   });
 
-  describe('RECEIVE_LISTS', () => {
+  describe('RECEIVE_BOARD_LISTS_SUCCESS', () => {
     it('Should set boardLists to state', () => {
       const lists = [listObj, listObjDuplicate];
 
-      mutations[types.RECEIVE_LISTS](state, lists);
+      mutations[types.RECEIVE_BOARD_LISTS_SUCCESS](state, lists);
 
       expect(state.boardLists).toEqual(lists);
     });
@@ -145,6 +145,33 @@ describe('Board Store Mutations', () => {
     expectNotImplemented(mutations.RECEIVE_REMOVE_LIST_ERROR);
   });
 
+  describe('RECEIVE_ISSUES_FOR_LIST_SUCCESS', () => {
+    it('updates issuesByListId and issues on state', () => {
+      const listIssues = {
+        'gid://gitlab/List/1': [mockIssue.id],
+      };
+      const issues = {
+        '1': mockIssue,
+      };
+
+      state = {
+        ...state,
+        isLoadingIssues: true,
+        issuesByListId: {},
+        issues: {},
+        boardLists: mockListsWithModel,
+      };
+
+      mutations.RECEIVE_ISSUES_FOR_LIST_SUCCESS(state, {
+        listIssues: { listData: listIssues, issues },
+        listId: 'gid://gitlab/List/1',
+      });
+
+      expect(state.issuesByListId).toEqual(listIssues);
+      expect(state.issues).toEqual(issues);
+    });
+  });
+
   describe('REQUEST_ISSUES_FOR_ALL_LISTS', () => {
     it('sets isLoadingIssues to true', () => {
       expect(state.isLoadingIssues).toBe(false);
@@ -155,10 +182,28 @@ describe('Board Store Mutations', () => {
     });
   });
 
+  describe('RECEIVE_ISSUES_FOR_LIST_FAILURE', () => {
+    it('sets error message', () => {
+      state = {
+        ...state,
+        boardLists: mockListsWithModel,
+        error: undefined,
+      };
+
+      const listId = 'gid://gitlab/List/1';
+
+      mutations.RECEIVE_ISSUES_FOR_LIST_FAILURE(state, listId);
+
+      expect(state.error).toEqual(
+        'An error occurred while fetching the board issues. Please reload the page.',
+      );
+    });
+  });
+
   describe('RECEIVE_ISSUES_FOR_ALL_LISTS_SUCCESS', () => {
     it('sets isLoadingIssues to false and updates issuesByListId object', () => {
       const listIssues = {
-        '': [mockIssue.id],
+        'gid://gitlab/List/1': [mockIssue.id],
       };
       const issues = {
         '1': mockIssue,
@@ -287,7 +332,7 @@ describe('Board Store Mutations', () => {
   describe('MOVE_ISSUE_SUCCESS', () => {
     it('updates issue in issues state', () => {
       const issues = {
-        '1': { id: rawIssue.id },
+        '436': { id: rawIssue.id },
       };
 
       state = {
@@ -299,7 +344,7 @@ describe('Board Store Mutations', () => {
         issue: rawIssue,
       });
 
-      expect(state.issues).toEqual({ '1': { ...mockIssueWithModel, id: 1 } });
+      expect(state.issues).toEqual({ '436': { ...mockIssueWithModel, id: 436 } });
     });
   });
 
diff --git a/spec/frontend/diffs/components/diff_file_spec.js b/spec/frontend/diffs/components/diff_file_spec.js
index 3c39dd2d385..0b0a7f966c5 100644
--- a/spec/frontend/diffs/components/diff_file_spec.js
+++ b/spec/frontend/diffs/components/diff_file_spec.js
@@ -90,8 +90,8 @@ describe('DiffFile', () => {
         vm.isCollapsed = true;
 
         vm.$nextTick(() => {
-          expect(vm.$el.innerText).toContain('This file is collapsed.');
-          expect(vm.$el.querySelector('[data-testid="expandButton"]')).not.toBeFalsy();
+          expect(vm.$el.innerText).toContain('This diff is collapsed');
+          expect(vm.$el.querySelectorAll('.js-click-to-expand').length).toEqual(1);
 
           done();
         });
@@ -102,8 +102,8 @@ describe('DiffFile', () => {
         vm.isCollapsed = true;
 
         vm.$nextTick(() => {
-          expect(vm.$el.innerText).toContain('This file is collapsed.');
-          expect(vm.$el.querySelector('[data-testid="expandButton"]')).not.toBeFalsy();
+          expect(vm.$el.innerText).toContain('This diff is collapsed');
+          expect(vm.$el.querySelectorAll('.js-click-to-expand').length).toEqual(1);
 
           done();
         });
@@ -121,8 +121,8 @@ describe('DiffFile', () => {
         vm.isCollapsed = true;
 
         vm.$nextTick(() => {
-          expect(vm.$el.innerText).toContain('This file is collapsed.');
-          expect(vm.$el.querySelector('[data-testid="expandButton"]')).not.toBeFalsy();
+          expect(vm.$el.innerText).toContain('This diff is collapsed');
+          expect(vm.$el.querySelectorAll('.js-click-to-expand').length).toEqual(1);
 
           done();
         });
@@ -135,7 +135,7 @@ describe('DiffFile', () => {
         vm.file.viewer.name = diffViewerModes.renamed;
 
         vm.$nextTick(() => {
-          expect(vm.$el.innerText).not.toContain('This file is collapsed.');
+          expect(vm.$el.innerText).not.toContain('This diff is collapsed');
 
           done();
         });
@@ -148,7 +148,7 @@ describe('DiffFile', () => {
         vm.file.viewer.name = diffViewerModes.mode_changed;
 
         vm.$nextTick(() => {
-          expect(vm.$el.innerText).not.toContain('This file is collapsed.');
+          expect(vm.$el.innerText).not.toContain('This diff is collapsed');
 
           done();
         });