Issues with frets in chord diagrams

[ctk]

I’m trying to make super basic chord diagrams for beginner lessons and I want them to only show 3 frets.

I can remove frets in the Chord Diagrams editor, but they don’t save or update in the project.

Is there something I am missing here?

[ludwignobel]

Engraving Options → Chord Diagrams: Default number of frets

[Derek_Williams]

Yes, but the Save button is greyed out so any departure from the default cannot be saved: