Nav instances disappear on mobile views

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.2.0 CE RC3
• Fix Version/s: 6.2.0 CE RC3
• Component/s: Frontend Infrastructure
• Labels: None
• Fix Priority: 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/14400

On mobile views, all instances of nav component collapse by default disappearing from view with no alternative solution.

Testing steps from LPS-40595:
Steps to reproduce:
Navigate to a page in the mobile view
Tap/click to navigate to the Add > Page sidebar

Expected results:
There should be page type options

Actual results:
There are no page type options

Testing steps from LPS-40382:
Steps to reproduce:

1. Add a page of Panel type, and check the box for Collaboration
2. Navigate to the Page in a mobile view (width is less than 980 pixels)
3. Click the Collaboration dropdown icon (which is also broken: LPS-40381)

Expected results:
The list of portlets should appear in the dropdown

Actual results:
No portlets are shown, and the icon doesn't do anything. Refreshing does not help. This issue may be related to LPS-40381

Testing steps from LPS-39998
1. Start Portal on a mobile device OR adjust your browser's width
2. Navigate to Control Panel > Users and Organizations

Expected Result: The user can navigate to User and Organization sub-pages (Browse, All Organizations, All Users)

Actual Result: The sub-page navigation list (e.g. Browse, All Organizations, All Users) does not appear