I am trying to print 2-up to 12x18 paper in order to get 9x12 sheets. There are a few places in finale to choose paper size and it seems no matter if I use Page Size under Page Layout, or Page Format under Document, or Printer Page Setup under File the result is that the page is centered and in the right direction but is formatted to a 8.5x11 sheet, or something smaller than the 9x12. The ruler on the Finale screen while looking at the page I want to print is showing 9x12 so the program seems to be responding and working how it should.  It seems to me a paper size setup issue.

When I am in page setup in the printing dialog, I don't have the option to custom size my paper so I am trying to find supported paper sizes as close to 12x18 as possible and so far (through trial and error) 11x17 comes closest.

How can I get what I am seeing in the finale chart to fill the 12x18 paper correctly?