Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 81)

81
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 [ 5 2 ] 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.280, 333).