fix: fixed expended view unit bar issue (#1356)

* fix: fixed expended view unit bar issue

* refactor: removed expanded width

src/courseware/course/sequence/sequence-navigation/SequenceNavigationTabs.jsx

@@ -1,15 +1,21 @@
-import React from 'react';
+import React, { useContext } from 'react';
 import PropTypes from 'prop-types';
 import classNames from 'classnames';
+import { getConfig } from '@edx/frontend-platform';
 
 import UnitButton from './UnitButton';
 import SequenceNavigationDropdown from './SequenceNavigationDropdown';
 import useIndexOfLastVisibleChild from '../../../../generic/tabs/useIndexOfLastVisibleChild';
 import { useIsOnXLDesktop } from './hooks';
+import SidebarContext from '../../sidebar/SidebarContext';
+import NewSidebarContext from '../../new-sidebar/SidebarContext';
 
 const SequenceNavigationTabs = ({
   unitIds, unitId, showCompletion, onNavigate,
 }) => {
+  const enableNewSidebar = getConfig().ENABLE_NEW_SIDEBAR;
+  const sidebarContext = enableNewSidebar === 'true' ? NewSidebarContext : SidebarContext;
+  const { currentSidebar } = useContext(sidebarContext);
   const [
     indexOfLastVisibleChild,
     containerRef,
@@ -23,7 +29,7 @@ const SequenceNavigationTabs = ({
       <div
         ref={containerRef}
         className={classNames('sequence-navigation-tabs-container', {
-          'navigation-tab-width': isOnXLDesktop,
+          'navigation-tab-width': isOnXLDesktop && currentSidebar,
         })}
       >
         <div