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How to Enable UltraWide Mode on Steam Deck

  1. Enable UltraWide Mode on the glasses.
  2. Go to the Steam Deck system Display Settings.
  3. Turn off Automatic Resolution.
  4. Set the resolution to 3840 × 1080.
  5. 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.