Page Setup "stuck" on "Legal"

How do I get PDFCreator to set a standard 8.5" x 11" size page as the default?  I recently had to reset a page to "Legal" to print some official documents but now I can't get it to go back to a standard 8.5" x 11" size page and stay there?

I've been using PDFCreator for years and thought I knew what I was doing, but that clearly isn't the case:  Even when Page Setup is selected as "Letter" I'm getting some extremely wide margins at the top and bottom (headers?)

Thanks