I've been trying to change the default playlist group format "artist - title" to just "title" in the "group format" field of the playlist qmms settings by putting only the "%t" constant or just leaving it empty (and clicking on the Close button later), but the playlist keep showing the artist name with the track name, there's something else I have to do? I really don't think so.
This feature work just fine in Audacious (it's called "title format") but not in qmms since I don't know when.
Press Ctrl+H and change format for each column.