Lightroom Classic: Cannot exit 'People' View from Keyboard [O] or Menu-View

Keyboard shortcut [O] will enter People Faces view, but it will NOT exit/toggle me back to Grid View.

Also the menu 'View > People'  will enter People Faces, but NOT exit/toggle me back to Grid View.

The only way I can toggle 'People View' off is by mouse clicking on the 'People' icon on the Tool bar.

Am I missing something, or is this a bug in Classic v9.1?