STEPS TO REPRODUCE
* open system settings
* navigate to "Appearance → App theme" (German: "Erscheinungsbild → Anwendungs-Stil")
* resize window so that sidebar is collapsed to one column and search field is hidden behind the "back" button
* type something in the search box
* click the "clear" button or clear the search field manually

WHAT ACTUALLY HAPPENS
The search field loses focus and the sidebar shows the sub-menu again.

WHAT I EXPECTED TO HAPPEN
The search field should have stayed focused to initiate another search. The main menu should be displayed below, with the "Appearance" item highlighted. When I click on the highlighted item, the sub-menu should show again.