Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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 Image Playback
396
In single-image display and two-image 
display (p.408), you can overlay the grid 
on the image playback.
With [33: Playback grid], you can 
select [3x3 l], [6x4 m], or [3x3+diag 
n
].
This function is convenient for checking 
the image’s vertical or horizontal tilt as 
well as composition.
3
 Grid Display
The grid is not displayed during movie playback.