In the options window (first tab) click Load UI Skin, uncheck the "keep my layout" box, and just pick whichever UI you are currently using (or take this chance to check out another one).
If you're looking for a new one to try, I've been using Deezy's latest UI, and it's really nice (lots of little usability improvements):
https://www.project1999.com/forums/s...d.php?t=350475