Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 99)

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AF Area Selection Modes
When AI Servo AF mode is set for Automatic selection AF, Large Zone
AF, or Zone AF, the active AF point <
S > will keep switching to track the
subject. However, under certain shooting conditions (such as when the
subject is small), it may not be able to track the subject.
With Single-point Spot AF, focusing with an EOS-dedicated, external
Speedlite’s AF-assist beam may be difficult.
If a peripheral AF point or a wide-angle or telephoto lens is used,
achieving focus may be difficult with an EOS-dedicated, external
Speedlite’s AF-assist beam. In such a case, use the center AF point or
an AF point close to the center.
In low temperatures, it may be difficult to see the Area AF frame and
Large Zone AF frame.
It may be difficult to see the AF points when looking through the
viewfinder while wearing polarized sunglasses or similar equipment.
With [ 2 4: Orientation linked AF point ], you can set the AF area
selection mode + AF point or only the AF point separately for the
horizontal and vertical orientations (p.132).
With [ 2 4: Selectable AF point ], you can change the number of
manually selectable AF points (p.130).