How to Enable UltraWide Mode on Steam Deck
- Enable UltraWide Mode on the glasses.
- Go to the Steam Deck system Display Settings.
- Turn off Automatic Resolution.
- Set the resolution to 3840 × 1080.
- The screen will now display in Ultra-Wide mode.
Note: This method only enables ultra-wide resolution for the Steam Deck system interface.
Whether ultra-wide mode is supported in-game depends on whether the game itself supports ultra-wide aspect ratios.