How to manually define what is a Music Album, Compilations etc

[tom80H]

There’s currently no way to manually change this.
However there’s a feature suggestion discussing for Plex to allow editing the release type information (overriding the default assignment from derived from musicbrainz)

Music Release Type (Category) - Manual Edit

MusicBrainz is difficult to use. In addition, there are rare syncing issues where Plex does not reflect the Release Type on MusicBrainz. I propose a Feature Suggestion, a single dropdown field that would allow for a manual Release Type edit. The new feature would probably require 20 or fewer lines of code.