Canon 1D X - Manual (Page 66)

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You can select the AF mode to suit the shooting conditions or subject.
1
On the lens, set the focus mode
switch to <AF>.
2
Press the <o> button. (9)
3
Select the AF mode.
While looking at the top LCD panel,
turn the <6> dial.
X : One-Shot AF
Z : AI Servo AF
2: Selecting the AF Mode
When the AF area selection mode is set to 61-point automatic selection AF
(p.74) or Zone AF (p.73), AF is possible while using the subject’s color and
face detection information (p.95).
COP
Y