Plutonium

I was told the only thing I needed to do was to enable Gamepad in the settings but I don't even have the option to do that because it's greyed out and not clickable. I have DS4 on, I have the controller setup, I have reset my game multiple times but it still remains greyed out

I added the game to steam, I launch it through big picture mode, I used the link for Shawn's config but my controller still doesn't work at all