Canon 2911B002 On-Screen Manual page 220

Setting the Stapling Margin Page 220 of 623 pages
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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