Canon EOS-1D X Mark III Af Setting Manualbook page 13

AF Configuration Tool
[Presets]
A combination of parameters to best suit the characteristics
of subject movement have been used to create the presets
from [Case 1] – [Case 4]. By selecting the case setting, the
different AI Servo AF and Servo AF settings can be selected
to suit the subject. The "AF Configuration Tool" must be
set for viewfinder and Live View shooting.
When you want to switch the
characteristics automatically
Case A
according to changes in the
subject movement.
Versatile multi-purpose
Case 1
setting.
Continue to track subjects,
Case 2
ignoring possible obstacles.
Instantly focus on subjects
Case 3
suddenly entering AF points.
For subjects that accelerate
Case 4
or decelerate quickly.
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The best parameters for
different subjects and
shooting scenes are
combined into presets from
[Case 1] - [Case 4].
With [Case A], the camera
automatically determines and
sets those parameters.