Canon EOS-1D X Mark III Af Setting Manualbook page 40

AF area selection mode / AF
method
Change the AF point selection to match
your shooting style
Set the "AF area selection mode" for viewfinder shooting, and
"AF method" for Live View shooting.
The AF point selection method can be
set to match the subject and conditions
Viewfinder shooting
Viewfinder shooting
Select AF points in a Zone area
You can select which AF points or AF point pattern to use
by using the "AF area selection mode or AF method".
Choose the selection of AF points that matches the subject
and shooting conditions.
Select only one AF point
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Live View shooting
Live View shooting