Uninstall question

[Wylari]

If I missed this answer while searching I apologize. If after downloading and installing a UI, what if I don't like it? How do you uninstall the UI, I mean do they come with uninstallers or do you just delete the directory? Of course I bet the answer in is the docs to whatever UI I download right? So if you can answer this question to a slow learner I'd appreciate the time.

Wylari