when I print (an org chart) with a background, the background is smaller than
the printed page, leaving a small background-less border. Also, if text on
the background is in that area, it will not print. i conclude that there must
be a way to size the background independently of the foreground. Where do I
find those setting (for example I've looked under Page Set up and do not see
any options there)?

Interestingly, if I make a .pdf of the file, the background has different
border margings than if I print directly to a printer.