Output page size problem

I need to output into PDF format a Word Doc formatted to 6" X 9" page size.  Before generating PDF I went to Options/Document Properties/DP 2 and entered a custom paper size of 432 X 684 (6X9) and then generated PDF file.

But the output is displayed on an 8.5 X 11 background (and Acrobat properties says it's and 8.5 X 11 format).  The actual text is the correct size, but the PDF page size appears wrong. 

Help! (and thanks)