Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 340)

Display Performance
You can select the performance parameter to prioritize in shooting screen display for still
photos.
1.
Select [ : Disp. performance].
2.
Select an option.
When set to [Smooth]
By pressing the < > button to add a checkmark, you can include
low-light locations in the scenarios for suppressing lower display frame
rates.
The high frame rate (119.88 fps) display of the [ Smooth ] option is used
for shooting standby in viewfinder shooting.
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