Also discovered this by accident recently. I have 200+ playlists and this type of search is the most reliable way of finding a saved or self-created playlist by name (looking at you "normal" Spotify search that always shows others' public playlists of the same name first).

Funny enough it's not documented, so let's see how long it will stick around for: https://support.spotify.com/kr-en/article/keyboard-shortcuts...