Canon EOS-1D X Mark III Advanced User's Manual page 345

Selecting the AF Method
1.
Press the <
2.
Select the AF method.
Each time you press the <
Note
You can also make your selection from [
The following descriptions apply to the camera with AF operation set to [One-Shot
AF] ( ). With [Servo AF] (
achieved.
> button.
: AF method].
) set, the AF point will turn blue when focus is
345
> button, the AF method changes.