Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 324)

Disable ( )
The image is displayed at standard brightness, so it is easy to see. Even if you set
exposure compensation, the image is displayed at the standard brightness.
Caution
Notes on [Exposure+DOF]
Display may flicker at some shutter speeds.
With EF lenses, this setting may increase the shutter-release time lag.
The depth of field shown is only a guideline. For more precise indication of the
depth of field, press the depth-of-field preview button.
[
Exposure+DOF ] is not available with some lenses.
[ ] blinks if either exposure or depth of field cannot be simulated, or if neither
can be simulated.
[
] is dimmed if either exposure or depth of field simulation stops, or if both
simulations stop.
Notes on [Disable]
In some drive modes, simulated images may be displayed during continuous
shooting.
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