You can run sudo apt purge xfce4 (if you wan to remove all of its components and dependencies) or sudo apt remove xfce4. <br> If you don’t have an other DE installed, I suggest you find one and do it form the other DE, because if you don’t, you’re gonna end up without a graphical environement, and you would have to do everything frop the terminal.
I installed linux on a new pc 2 days ago, had no problem with the wifi drivers. I don’t know if it’s the fact that the wifi is integrated on the motherboard, but it was up and running without any tweeking from me (unlike windows)