This is a reflection of the ability of the current printer driver. Few printers can print to the edge of the page and the active printer driver determines the limits of the printable area. (PDF is essentially a print emulation).

If you want the PDF to have the colour to the edge of the page, you need to set the active printer driver to one that can print to the edge of the page. One such example would be Primo PDF, and if you are going to use that, you might as well also use it to create the PDF.

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com