Canon PIXMA MG4200 Series On-Screen Manual page 827

Note
If you do not need more scanning, press the left Function button. The machine starts copying.
You can add the copying job while printing.
Adding the Copying Job (Reserve copy)
If you use this function in combination with Two-sided copy, the Document setting screen is
displayed after scanning the fourth sheet of original is complete. Follow the on-screen
instructions to scan the rest of originals.
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