Windows 7, Poser Pro 2012

Hi,

I've always rendered according to the size of my display window, which is 1135x816 - I'm assuming that is the dimensions out of the box, because I don't recall changing it - and then when I render, I make the render larger, but use the same dimensions ratio, so that what I see on the poser window is exactly what  I get in my finished render (I hope that makes sense). Anyway, I'd like to try my hand at an illustrated novel on Amazon, which call for a 9:11 ratio. How do I change that in Poser? When I go to Window - Document Window Size, it says I have to "Float Palette". I do, then I type in "1002 x 1502" and it automatically defaults to   1002 x 1050. I want a Poser window that is 1002x1502. Is that impossible.

I'm sending this from an airport, about to step on a plane. Will land in a couple of hours and hopefully someone can help me out. Thanks!