How do I clear the world-quick loads in the File Menu?

Simple. How do I clear the world-quick loads in the File Menu? Or, er...whatever they are. The numberthings that load the various worlds you have saved.:-)

Problem is, I have 9 entries, cuz I recently cleaned up my worlds dir. I want to cut it down a bit.

Using 3.15

If you attempt to use one that isn't there, it disappears from the menu. That is the simplest way of doing it.