In case you also will get this error someday “cannot read properties of undefined” in the Steamdeck UI when you try to go into a Game, let me spare you the headache and tell you: It’s probably due to an old decky plugin manager😅 I managed to fix it going into the desktop, loading the decky installer again from the github page and running it, then when it asks you just tell it to “update to current stable version”. After returning into Steamdeck Mode it now works again and you can update specific plugins if necessary.🎮
Steamdeck UI Error
Andreas Arfaoui
@Heiji