MS 4.4.2 > Style>Fretboard Diagrams
It’s standard that a click on a text label alters the state of a checkbox or radio button, and MuseScore generally adheres to this norm.
In the following locations label clicks have no effect / The user has to click directly on the control icon:
Style>Fretboard diagrams
Fret Number
Position>Left
Position>Right
Format:
Number only
Custom suffix:
Non-functional properties
Style>Fretboard diagrams>Edit fret number text style
... in other words the x, y properties for Fret Marks, discussed here
Examples of functioning properties
Dot Size
String spacing
Fret Spacing