Most printers cannot print all the way to the edge of the page.
The white border is likely a limitation of your printer, not of Word.

kenworthington wrote:

Help! I'm trying to create an A4 Leaflet that has 3 columns (you know, the
type where you fold it twice to make a 6 sided leaflet). I want to put a
background image that fills the inside 3 pages - I've put a .gif in there no
problem and it looks fine in Word until you go to print preview where there
is a white border around the edge of the page. How do I get rid of this
border so that the image fills the print area but the text remains where it
is? I've tried setting the page border to none but that made no difference at
all. Somebody mentioned setting the page to borderless A4 but I can't see any
options for this.

Somebody please help!!