Vertical Spacing question

[Mischa Falkenburg]

Hello All,

I'm using version 2.12.1, and my piece utilizes a GrandStaff with 6 Staffs.
The .pdf file generated shows all the pages, except for the final page, 
with a big space between two GrandStaffs.

I would like to modify the spacing so that three GS's would show on each 
page. Is this possible?

Thanks-in-advance,

Mischa