Margin settings on Page Setup of Print dialogue window always grayed out at 1"
Whether I'm trying to print a PDF I create myself, or a commercial product user manual (PDF editing restricted), the margin settings on the Page Setup popup within the Print Dialogue window are always grayed out, showing 1".
I often need to print large PDF manuals in a 2-up format (2 doc pages per printed page).
Printers add extra white space between the 2 page images, so I need to reduce the PDF margins as much as possible to thus make the text larger and more legible.
The margin settings are grayed out for all three of my printers (Xerox Phaser office printer, Brother laser printer, Epson Inkjet printer). They are grayed out even if I don't use the 2-up option and print the normal 1 doc page per printed page.
Is there a way to reduce margin size in all cases, even when the PDF is not editable?
Help would be much appreciated. Thanks.

