Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 333)

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3 Menu Function Settings
AF method
You can select [ u +Tracking ] or [ FlexiZone - Single ]. See page
284 for the AF method.
Grid display
With [ 3x3 l ] or [ 6x4 m ], you can display grid lines to help you
level the camera vertically or horizontally. Also, with [ 3x3+diag n ],
the grid is displayed together with diagonal lines to help you
compose with better balance by aligning the intersections over the
subject.
Note that the grid is not displayed during movie shooting.
Movie recording quality
You can set the movie-recording format (MOV or MP4), movie-
recording size, 24.00p, and High Frame Rate. For details, see page
311.
Sound recording
You can set sound-recording settings. For details, see page 322.