After updating to iTunes 12.4 I find that when I view the library of another person I can no longer filter the view to show me just the music (or other things) that are on the other library but not on my library. We have one computer still on iTunes 12.3 and the feature is still there.
Where did this feature go or where do I find information on how to achieve the same effect in a straightforward manner?
iPhone 6s Plus, Windows 10, playlist sharing comparing