Canon EOS-1D X Mark III Af Setting Manualbook page 47

Spot AF
[Spot AF] mode can be used to focus on
a small area of the subject.
AF Focusing on a small or narrow area.
Viewfinder shooting
[Spot AF (Manual selection)]
When set to [Spot AF], a small rectangle is displayed
inside the manually selected AF point.
[Spot AF] mode makes it possible to focus on the exact area
even when there is an obstacle near the area you want to
focus on. A common example is when shooting sports
through a fence or net.
Live View shooting
[Spot AF]
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