Before the first launch, add the following launch option: "SteamDeck=0 %command%". This will open a launcher that lets you configure graphics settings. After the first launch, you can remove the launch option and it will boot straight into the game. In the launcher, set Antialiasing to TAA, Shadow Quality to Medium, Shadow Distance and Decal Quality to High, Godrays Quality to Low and enable Screen Space Reflections, Screen Space Ambient Occlusion, Precipitation Occlusion, Snow Shader, and Lens Flare. Make sure 64-bit Render Targets is OFF. In GameScope, set the frame limit to 60fps/60hz. The game runs at a nearly locked 60 FPS and looks great!