It'd be nice if the "Filter" or "Search" function on top of playlists, to search a song in a playlist, would be reactivated. The current solution through the 'three dot' menu is not pleasant.
The 'three dot' menu has now too much options and that makes it even more confusing.
Updated on 2018-12-06
As @Jose_M mentioned, a similar idea has also been suggested here:
Please vote for it, and add a comment there, so it may be considered. Any update on the matter should be posted there.
For more info on how the Ideas Board works, click here. :)