Double (back)-click to exit (the app)?

[immerzu]

Hello,

First of all, thanks for this app. I've been using it for a few days now. I was looking for a successor to my RSS reader app, which is no longer functional under Android 15, and I've found it now.
What I would like is: When I click 'back' once, all feeds should 'appear'. If I then click 'back' again, the app should be closed.

Thanks!