Here's how to remove a song from a playlist folder:
1) Open the playlist folder that you want to remove a song from.
2) In the Songs section, locate the song that you want to remove from the playlist folder.
|3) Click the more / 3 dots button to the right of the song title.|
|4) Click Remove from playlist.|
|5) In the pop-up that appears, click Remove.|
Note: this will only remove the song from the playlist folder and will not delete the song from your catalog.