I use KeePassXC its free works on what I use. The encrypted list of passwords is synced with my phone twice a day with Syncthing. Chrome had a fit with the android app to I switched to Firefox after. I selfhost it because it’s free and I know enough to troubleshoot any problems.

You can, it requires a startup command: “steamdeck=0 %command%”

Put that, without quotes in the game properties. You can start the game without it, but matchmaking is blocked.