Is there a way to centre this staff name?

The SA centred instead of right-aligned. I tried centring them in Edit Staff Name but it didn’t change the score display.

staff name.png

You need to change the alignment for the corresponding paragraph style. The alignment options in that dialog don’t work.

Do you mean the staff name paragraph style? If I do that, all staff names will be centred which is definitely not what I need.

You can create another paragraph style just for that staff name and select it in the instrument names dialog.

Maybe the quick-and-dirty way would be to add a small space after the S to make it look right.