Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 95)

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S Selecting the AF Area and AF Point
Pressing the < S > button lights up the AF points that are cross-type AF
points for high-precision autofocusing. The blinking AF points are
horizontal-line or vertical-line sensitive. For details, see pages 100-108.
You can register a frequently-used AF point to the camera.
When you use the button set with the [
8 6: Custom Controls ] (p.445)
menu’s detailed settings screens for [ Metering and AF start ], [ Switch
to registered AF point ], [ Direct AF point selection ], or [ Register/
recall shooting func ], you can instantly switch from the current AF
point to the registered AF point.
For details on registering the AF point, see page 450.
AF Point Display Indications
Registering the AF point