Oh my god, this has popped up a lot lately at work, teachers that have been with us for like 3 years, every like 3 months comes and say "UHM I FORGOT MY PASSWORD AGAIN"
@E-Waste Gamer after this step, reboot. complete the bazzite portal, login to steam, and it's recommended to reboot again, and you will be in Game Mode
honestly it would be easier to backup all of those drives and reformat the drive to ext4 or btrfs, then put them back. but only easier if you have access to storage that can fit all of those games