Are you using #Jitsi meet? I proposed a feature you might know from your screen presentation tool or your projector remote: blanking or freezing the screen content so that you might do something in the background without showing what you do.
Very handy for demos, password interaction, fixing things, looking up something, ...
Unfortunately, #JitsiMeet is deleting feature requests like that after two months if they don't get implemented meanwhile.
You might want to jump in to this discussion if you find this useful:
https://github.com/jitsi/jitsi-meet/issues/15019#issuecomment-2675937797