I work from home and my kids routinely come downstairs while I have the game on or a movie playing in the home theater, I was wondering if there's an Android TV app that can simply show a black screen that I could map to my Netfilx button? I can click power but it would be much faster for me to resume once they grab their toys if I could essentially alt-tab to a blank screen that won't interest the kids.

I tried a photo gallery app with the idea of opening just a black picure but when you launch it it opens a sort of control centre instead of a particular photo. Any ideas welcome!