Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 703)

Playback Grid
You can display a grid over still photos shown in single-image display on the playback
screen. This function is convenient for checking the image's vertical or horizontal tilt as well
as composition.
1.
Select [ : Playback grid].
2.
Select an option.
Note
When panoramic images are displayed, a single vertical and horizontal line are
shown if [
Playback grid ] is set to an option other than [ Off ].
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