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The original was posted on /r/steamdeck by /u/Level_Cellist_4999 on 2024-04-25 20:30:46.

To fix the 90hz/45fps issue please do the following 2 things.

1. Follow this guide for a robust FPS fix (no need for iPresentInterval). This will remove the hardcoded sync interval in the engine. And it will not break when settings are changed.
2. When you’re done with that, you should have a command in a command launcher. Now go and add SteamDeck=0 to the launcher (before %command%). This will give you an option to launch a game with the launcher where you can add settings.

I can confirm that it works.