Left/Right music frame margins?

I see that there is a setting for top/bottom music frame margins, but not for left/right margins. Is that to be done somewhere else? The braces are on the left of the frames right now:
Screen Shot 2017-07-07 at 07.49.28.png

No, it’s intentional that the system will proceed exactly from the left and right edges of the frame. The only time this will not be true is when your system is showing staff labels.

OK, thanks.