As a work around:
pkill steam
steam
Hello @mtdeguzis, since this is an issue with steam's interface and not Proton itself, let's track this issue in the Steam-for-Linux issue tracker at https://github.com/ValveSoftware/steam-for-linux/issues/5631.
Tested a few games from the list, and many many thanks! I saw you could enable the option to allow Proton to work with any game, even if not on the approved list (say you wanted to test one out). Is this possible to toggle on SteamOS?
https://steamcommunity.com/games/221410/announcements/detail/1696055855739350561