Canon EOS-1D X Mark III Af Setting Manualbook page 45

Large Zone AF
During viewfinder shooting, the AF points are divided
into three zones (left, center, and right), and focus
point is selected from within the selected zone. During
Live View shooting, the AF frames are divided into
large vertical or horizontal zones within the AF area
(up to approximately 90% horizontally and 100%
vertically of the image area), and focus point is selected
from within the selected zone.
Viewfinder shooting
[Large Zone AF
(Manual selection of zone)]
Live View shooting
[Large Zone AF (vertical)]
Live View shooting
[Large Zone AF (horizontal)]
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