Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 326)

Caution
Setting this feature to [ On ] sets [ : Display simulation ] to [ Disable ].
Optical viewfinder simulation is used for display when this feature is set to [ On ] in
HDR shooting.
Creative filter display is used when shooting with Creative filters, even if this feature
set to [
On ].
Image brightness before and after One-Shot AF is more likely to change when set
to [
On ] than when set to [ Off ].
Optical viewfinder simulation is not used during display to external monitors,
including in display to both an external monitor and the camera screen.
Depending on setting screens, optical viewfinder simulation may not be used for
display.
Display may not resemble an optical viewfinder in some cases.
The display appearance may change during continuous shooting, with some
combinations of drive and shutter modes.
Note
Not available for multiple exposures or in RAW burst mode.
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