Left Clicking a menu that contains an option with a submenu will cause the submenu to close while hovering its options

If a menu has an entry that is a submenu, and that submenu has entries in it that are also submenus, then the entire menu will close when left clicking the submenu button instead of hovering it.

Some other examples from users:
1. "Add/Import Content" when right clicking a folder in the Content Browser.
2. "Manage Collections" when right clicking an asset (a Material or Blueprint, for example) in the Content Browser.

1. Create or Open a project with Preview 2
2. In the Main Menu Bar left click Build
3. Left Click Lighting Info
4. Hover the mouse around the options in the submenu of Lighting Info

Expected Results:
Menu remains open and users are able to access submenus

Actual Results:
Menu closes