Have you tried using the scaling options, you can find this on page 154 of the user guide found here. If this doesn't help you, I would suggest calling into the support center for support @1-800-821-2797.
I'm trying to enlarge a visio diagram. On A3 it's still too small.
Is there a setting to enlarge this a print across x4 A3 pages making A1 size? I could then just blue-tack the 4 A3 docs together on a wall.