My one friend could use the steam controller on here. But can I use the PS4 controller on here. I can use it on steam. So how do I connect if I can

The email said to search in the profile, but there's no option to change anything. Am I missing something?

I play on an older computer and use a low resolution at full screen. Every time I accidentally minimize the game as opposed to Alt-Enter it changes it to the highest resolution. Is there any way to fix this? Thanks.