Canon PIXMA MG4200 Series On-Screen Manual page 582

You can set the quiet mode from the operation panel of the machine, the printer driver, or
ScanGear (scanner driver).
No matter how you use to set the quiet mode, the mode is applied when you perform operations
from the operation panel of the machine or printing and scanning from the computer.
If you specify a time for Use quiet mode during specified hours, quiet mode is not applied to
operations (copy, direct print, etc.) performed directly from the machine.
3.
Apply the settings
Make sure that the machine is on and click Apply.
Click OK when the confirmation message appears.
The settings are enabled hereafter.
Note
The effects of the quiet mode may be less depending on the print quality settings.
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