The Browse by Artist section looks at songs metadata and groups first by album artist field and then album field
If a song does not have a value for Album Artist, then it goes into the UNKNOWN ARTIST section
If a song does not have a value for Album, then it goes into the UNKNOWN ALBUM section
Filters
This section has the same filters as Browse by Folder plus two other filters
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Artist Artwork Filter
If set to With Artist Artwork only shows albums that have a Album Artist image in the metadata -
Cover Art Filter
If set to With Cover Art only shows albums that have a Cover art image in the metadata
When you click on an Album you are taken to the Song Details Summary