Canon mp620 - Manual (Page 237)

Poster Printing or Booklet Printing is selected for Page Layout.
Scaled Printing is selected for Page Layout (If Duplex Printing is also selected, only Staple Side is
selectable).
Borderless Printing check box is checked (If Duplex Printing is also selected, only Staple Side is
selectable).
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Page 237 of 815 pages Setting the Stapling Margin