Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 335)

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3 Menu Function Settings
Movie Servo AF tracking sensitivity
You can change the Movie Servo AF’s
tracking sensitivity to one of seven
levels. This affects the responsiveness of
AF tracking sensitivity when the AF
points stray from the subject, such as
during panning or when an obstacle cuts
across the AF points.
This function is settable when [ Movie
Servo AF ] is set to [ Enable ] and [ AF
method ] is set to [ FlexiZone - Single ].
Locked on: -3/-2/-1
This setting makes the camera less inclined to track a different subject if
the AF point loses the original subject. The closer the setting is to the
minus (-) symbol, the less the camera is inclined to track a different
subject. It is effective when you want to prevent the AF points from
rapidly tracking something that is not the intended subject during
panning or when an obstacle cuts across the AF points.
Responsive: +1/+2/+3
This makes the camera more responsive when tracking a subject that
covers the AF point. The higher the setting to the the plus (+) symbol,
the more responsive the camera is. It is effective when you want to
keep tracking a moving subject as its distance from the camera
changes, or to rapidly focus on another subject.
Setting [ AF method ] to [ u +Tracking ] gives the same effect as setting [ 0 ].