When you first launch the game, it will need to install InstallAnywhere, once it is complete, and if you've set the launch options and switched to experimental proton, you will likely see a black screen. To get past this, you need to press the Steam Button + Right Dpad to select the "continue" button you can't see, then you should see the luncher and it should start updating. After it is updated, you can click play and launch the game.

When you first open it after updating the game will ask you if you want to turn on Accessibility mode which switches the game to Gamepad mode, I HIGHLY recommend enabling it from the start to enable this otherwise you'll need to switch when you're already in game, likely with some external keyboard or mouse.

ALSO, very important:

Whenever you launch the game, it wiill always open the launhcer just like PC to load updates and news and stuff. Once you hit play, and get into game, Press the Seam button then go down to where you can "Switch Windows" and press "X" to close the window for the launcher. This is because it stays open and causes frequent stutters in game, this fixes that.