If you right-click the setlist then tap the overflow menu at the top right, you will see an option for "Rename".
If you want to remove songs from the Setlist on the library screen, you do need to select every song first. Otherwise you have to edit the setlist and make the changes in the editor. The editor has a clear button to remove all songs at once if that is what you are trying to do.
If you want to remove songs from the Setlist on the library screen, you do need to select every song first. Otherwise you have to edit the setlist and make the changes in the editor. The editor has a clear button to remove all songs at once if that is what you are trying to do.