I am a keyboard fan - much faster to navigate with keystrokes.

If you have an album with matched tracks when you navigate to a track and press the left arrow key it should move the selected item to the album.

But sometimes it takes two presses to make that happen - and once you have done it for a particular track it then seems always  to only need one press in future.

A quick test on albums with unallocated tracks shows that files allocated to tracks makes no difference.