This enables a multiple panel mode that supports a New Facets style. Panels can also contain a tree view or album art.
See help on the "Views" tab for setup guidance.
Playlist source
Active playlist
The sort order of the playlist is used, except for multi-value tag or soft splitter views where sorting is necessary. Items are highlighted in the playlist, not sent.
Other playlists
These behave the same as the library source.