'Apply to all parts button' greyed out on master score
I don't know if this is expected behaviour, but it is confusing:
The 'apply to all parts button' in Format>Style is greyed out on the master score, but usable on different parts. There shouldn't be a reason for it to not be available on the master score - style changes are most often made there first.
Workaround is to make style changes on a part, then click the button.