Then do the basics
- Verify your game files through Steam Verify Integrity of Game Files - How To’s - Knowledge Base - Steam Support
- Delete (or rename for backup) the Proton prefix for this game, located at ~/.local/share/Steam/steamapps/compatdata/{APP_ID}/ where {APP_ID} is the Steam application ID (find it in the store page URL for the game, or in ProtonDB site, or in SteamDB site, and so on…)
- Select the Proton 7.0 version in Steam Settings globally (not the Experimental, not an external one), and do not force another Proton version in the game Properties → Compatibility tab
- Make sure you have the system and video drivers up to date
- Add the proper launch option in the game properties to use Nviia card, so the prefix is initialized with the Nvidia card used, like you eventually want to achieve
- Reboot (to discard issues which would have been solve by rebooting), and test