Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 926)

Shutter at Shutdown
You can set whether to leave the shutter open or close it when the camera's power switch is
set to <
>.
1.
Select [ : Shutter at shutdown].
2.
Select an option.
: Closed
Closes the shutter. Normally set to closed, to prevent dust from
adhering to the sensor when you switch lenses.
: Open
Leaves the shutter open. This keeps camera quieter when the power
switch is set to <
> or < >. Useful when you want to shoot
quietly.
Note
Regardless of the setting, the shutter remains as it is when auto power off is
activated.
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