You need to enable it in Steam's settings, under Steam Play
Honestly, this needs to go away, there is never a scenario where Linux gamers only want to play some of their games. There should be instead some pop up window for non proton verified games instead of an obtuse setting.
Honestly, this needs to go away, there is never a scenario where Linux gamers only want to play some of their games. There should be instead some pop up window for non proton verified games instead of an obtuse setting.