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

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You can display a grid in the viewfinder to help you check the camera tilt 
or compose the shot.
1
Select [Viewfinder display].
 
Under the [52] tab, select 
[Viewfinder display], then press 
<0>.
2
Select [Grid display].
3
Select [Show].
X
When you exit the menu, the grid will 
appear in the viewfinder.
l
 Displaying the Grid in the Viewfinder
You can display a grid on the LCD monitor during Live View shooting and 
before you start shooting a movie (p.309, 382).