Known issue, its a bug in Proton. You must run the game in windowed or borderless mode.
Oh okay I get it. Yeah Persona 5 is giving me trouble. I tried to put the game in Borderless/Windowed and the Trainer still does not work. I can't choose Steam or Xbox/Epic it just does not respond. I also try to use tge steam deck tools game settings. Still no good. Thanks for letting me know.