There are many existing masks available on the File Naming tab so you can simply select a different one from the Compilation rename mask dropdown.
The masks with a naming convention of Album ArtistOrVariousArtists … are the default used for Compilation mask to ensure that if the album artist is not set then the song will use Various Artist rather than labelling each song based on the track artist. However there is not really a way that album artist cannot be set so you can safely use any of the other variants, I would recommend using:
Album ArtistOrArtist/Album/DiscIfMultiDisc/Track - Title
Of course you can also edit masks or create new ones.