New Feature: Albums / Single & EPs / Live Albums

Album, EP and Single are Primary types. A release group (album) can have a maximum of one Primary type.

Compilation, Live, Remix etc are Secondary types. A release group can have multiple Secondary types.

Available release group types are listed at Release Group / Type - MusicBrainz

After updating MusicBrainz for a release or release group Refresh Metadata in Plex should suffice without the need to do the Plex Dance, but there may be a delay depending on the nature of your edits, whether voting is required and whether there is any caching involved.