Canon PRO-10 Series Manual page 606

5.
Set the print paper size
Check the Scale to fit paper size check box. Then from the Destination Paper Size pop-up menu,
select the paper size that is actually loaded in the printer.
6.
If necessary, check the Scale down only check box
When you check this check box, the document will be reduced to fit to the paper size when the
document size is larger than the page size. The document will be printed in the original size when the
document size is smaller than the page size.
7.
Complete the setup
Click Print.
When you execute print, the document will be enlarged or reduced to fit to the page size.
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