Under Windows this is an option in the AMD control panel. Not sure how to enable it.
Specifically, this is for a non-native Proton game with FSR support built in. I am not using GE as I need the latest code in Proton experimental to run this game.
Yeah, don't do that. You're asking for the game to shut off at best. They probably won't have the anticheat configured to outright ban you for that but, as a general rule: do not tamper with multiplayer anti-cheat protected games.
My recommendation would be to go to their discord and request the option.
EDIT: I will say this is overly cautious advice, I've never seen Crytek in general or any other developer ban people for using render alternating software that wasn't specifically designed to be a cheat.
FSR already incorporates CAS towards the end of the scaling process. The Adrenalin equivalent is called RIS but applies CAS to the entire rendered frame. I believe some apps allow you to tune CAS individually (2077 comes to mind?)
portproton handles it all with an easy GUI window with on/off tabs for setting up the game with ease
A project that aims to make it easier for both novice and experienced users to run Windows games on Linux.
The project aims to make the process of running games (and other software) as easy as possible, but at the same time provides flexible settings for experienced users.