Change group(s) of the track from the track editor
It's not very intuitive to move songs between track groups.
For example, if I want to promote a song from my 'play less often' group to my 'play more often' group, it has to be done via Manage Track Groups, remove the song from the existing group, and then find the song in the list of songs not in the new group. Easily to get lost, or orphan a song.
It would be easier to go into the song editor and change categories in there.