Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 91)

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The camera has 61 AF points for autofocusing. You can select the AF
area selection mode and AF point(s) suiting the scene or subject.
You can select one of seven AF area selection modes. For the selection
procedure, see page 93.
Single-point Spot AF
(Manual selection)
For pinpoint focusing.
Single-point AF
(Manual selection)
Select one AF point to focus.
AF point expansion
(Manual selection )
The manually-selected AF point < S >
and four adjacent AF points < w > (above,
below, on the left, and on the right) are
used to focus.
S
Selecting the AF Area and AF Point
AF Area Selection Mode
Depending on the lens attached to the camera, the number of usable
AF points, AF point patterns, Area AF frame, etc. will differ. For details,
see “Lenses and Usable AF Points” on page 102.