Canon EOS-1D X Mark III Af Setting Manualbook page 63

Auto selection AF is effective for shooting
moving objects prioritizing composition.
Hints & Tips
With AF4 [Initial Servo AF pt, during
/ ], it is possible to have Auto
selection AF start from a manually
selected AF point.
During AI Servo AF, if the [Initial Servo AF pt,during
/ ] setting is [Auto], the first subject to be
captured will be selected automatically. When you
want to start shooting from a manually selected AF
point, set to a setting other than [Auto]. (Refer to P.
105) This is useful when you do not want to leave the
first subject up to the camera.
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