Is there an option for, when selected, having the Playlist Folder behave as a merged playlist of all playlists within?  This is how the Apple Music desktop app works and it kind of handy.

For example if I have a Playlist folder called "Work Playlists" and within that folder I have several playlists that I've created, as well as playlists that I've saved from other creators, or a smart playlist. I would be able to select the folder itself and instead of just showing the sperate playlists, it would show (and play) a merged playlist.

If you right click a Playlist Folder name, you should get an option in the context menu to Shuffle. That's the only way I know at the moment to do that.