That is not a part of MobileSheets. That is the Windows volume OSD. I've included links below related to that. The original HideVolumeOSD hasn't been updated since 2022 and some people said it stopped working. Someone else forked the repository and made it work with the latest Windows 11 updates. So the first link below is the reddit discussion on it, followed by the release you could download of that fork, below that is the original HideVolumeOSD page, and below that is an older article discussing it.
https://www.reddit.com/r/Windows11/comme...lumeosd_i/
https://github.com/gpkgpk/HideVolumeOSD/releases
http://wordpress.venturi.de/?p=379
https://www.howtogeek.com/269011/how-to-...-8-and-10/
Mike
https://www.reddit.com/r/Windows11/comme...lumeosd_i/
https://github.com/gpkgpk/HideVolumeOSD/releases
http://wordpress.venturi.de/?p=379
https://www.howtogeek.com/269011/how-to-...-8-and-10/
Mike