Go to advanced tracklist editor for VA release.
Click credits for an artist
Type in some artist name. Search box automatically opens. If you click outside the box, it closes as expected.
However, type in some other artist name and click the magnifying glass manually to do a search. Click it a couple of times to avoid timing issues with the 'automatic' popping up.

>> Suppose you don't want to choose those results - now there seems to be no way to get rid of the search dialog that has popped up. If you click "credits" to close the credits dialog, the search overlay is still visible!