Fixed issue boards focus mode when new navigation is turned on

Closes #35449

app/assets/javascripts/boards/boards_bundle.js

@@ -33,7 +33,7 @@ $(() => {
   const $boardApp = document.getElementById('board-app');
   const Store = gl.issueBoards.BoardsStore;
   const ModalStore = gl.issueBoards.ModalStore;
-  const issueBoardsContent = document.querySelector('.js-focus-mode-board');
+  const issueBoardsContent = document.querySelector('.content-wrapper > .js-focus-mode-board');
 
   window.gl = window.gl || {};
 

app/assets/stylesheets/pages/boards.scss

@@ -73,6 +73,7 @@
     width: 100%;
     height: 100%;
     top: 0;
+    left: 0;
     background: $white-light;
     z-index: 500;
 

changelogs/unreleased-ee/new-navigation-issue-boards-focus-mode.yml

+---
+title: Fixed issue boards focus mode when new navigation is turned on
+merge_request:
+author: