How do I search within playlists in Apple Music?

How do I search within a playlist in Apple Music? I don't mean search within "YOUR LIBRARY" but within a specific playlist I've created. It would make it easier to reorder a playlist and find songs for that reason...

Side question: Is there a way to prevent duplicates within playlists? Or an option to turn on that I don't see?

So frustrating that Spotify has features like this for so long and Apple Music still has these glaring problems.