@pichalite I see.
edit the theme template
Yes, that's probably what I need, but is there a guide for this specifically? I tried looking at the theme and I got lost.
I have some custom CSS that puts a box around each category, but even with this disabled, the X or close button in the top right corner of chat windows does not show up. Edit: Looks like it only does it with the Flatly theme. If I go into my settings on this site and select Flatly, it does it here as well.