Spotify's latest version has removed the search filter, and users can no longer use Ctrl-F (or Command-F) to filter playlists and your music in the search for a single song or artist.
What sets Spotify apart from competitors is its users' control over the song they want to listen to, so taking away the search filter is highly detrimental to Spotify, both as a business and for its users.
Please bring back the search filter! Manually scanning playlists is extremely tedious, especially with hundreds of songs in larger playlists.
Thanks for the feedback.
This feature will come back in upcoming updates. Any news will be announced here: