Canon i-SENSYS MF6140dn User Manual page 247

For details on the settings, see the following items.
"Selecting Copy Papers"
"Adjusting the Density"
"Selecting the Document Type"
"2-Sided Copying"
"Enlarging/Reducing Copies"
"Copying Multiple Documents onto One Sheet (N on 1)"
"Collating Copies"
"Erasing Dark Borders and Frame Lines (Frame Erase)"
"Emphasizing the Outline of the Image (Sharpness)"
6
Select <Apply> using [
7
Select <Yes> using [
Follow the same steps for overwriting settings as well.
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] or [ ] after you have specified the setting and press [OK].
] and press [OK].