How can I make a panel behave like e.g. Spotlight
or the input method
such that
- the window does not activate the app
 - the window does close editors of other windows
 - the window receives keyboard input
 - closing/hiding the window does not hide the entire app (settings window may be open)
 
Tried the suggestions in
- How to show a window without stealing focus on macOS?
 - Show Window without activating (keep application below it active)
 
But none of them achieves the same behavior.

