I was messing around with the Notehead Sets trying to make a new set with noteheads for cluster notation. At first I misunderstood the copying and ended up changing some default noteheads. I now understand how this works and have reverted the changes back to factory settings.
What I’m doing now is duplicating the larger noteheads and then I duplicate and rename each notehead. However, I am unable to remove these custom-made sets as well as any of the noteheads in these sets. All the delete buttons and the ‘remove notehead from set’ buttons are greyed-out.
Set I want to remove entirely:
