Back to full screen on steam deck

I'm playing on steam deck and after the update it seems to be in wide-screen with no way to turn it into full screen. The screen on the steam deck is already small now I've lost more of the screen with it locked into wide-screen.

Any fixes that can change it back to full screen?

same here, but it seems more like 1280x800 res. become 1280x720

I facing the same problems after update , totally spoiler the gaming experience