Jazz grand staff set-up

I want my piano grand staff score to appear in the "musejazz" style, When I open the "Format" tab in the top menu when the existing score is open, and proceed to "Style" I can see the "musejazz" option. When I click it on, my score changes to the way I want it. But the page that offers the various style choices is too tall - preventing me from seeing the "Okay" in the blue box at the bottom (which will effect the change). When I pull the top of the page further up with my cursor, I can see the "Okay" box, but when I release my curser to click on that box, the page drops before I can get to the box to authorize the change to "musejazz'. How can I create a jazz grandstaff? (I can easily do it for a single staff, to create a lead sheet, but not for a grandstaff.)