I switched modes and can now see all the properties that I am interested in.

> In the basic (default) mode, almost all properties are hidden to prevent
> from unintentional errors (it is very simple to damage document by
> simple property change) and of course to lower down properties number.
> In the Tools->Options (or F9), on the Editor tab, you can select

I see what you mean about it being easy to damage a document.  After editing the page boxes, ghostscript reports that the file is damaged and resizes the boxes to 612x792.  I'll continue doing some experiments to see if I can edit the boxes without damaging the PDF document.

Thanks for all the information.

-Andy Meier