mixvibes 2.4 -- add KEY to Active Search Properties?

My computer crashed and my settings file got corrupted causing mixvibes to freeze on startup. So I deleted the settings file and restarted. It doesn't freeze now!
However "Key" seems to have disappeared from my search filter and I can't figure out how to get it back. What I'm talking about is when you go to the search box at the top right of the file list and click on the little icon in the left of the box that brings up the "active properties" list. How do i add properties to this list???
However "Key" seems to have disappeared from my search filter and I can't figure out how to get it back. What I'm talking about is when you go to the search box at the top right of the file list and click on the little icon in the left of the box that brings up the "active properties" list. How do i add properties to this list???