Canon EOS-1DX MARK II Settings Manual page 51

Choose whether only one AF point is used,
or select from a vast array of AF selection
options
The EOS-1D X Mark II is equipped with 61-point AF. This
flexible system allows the following, via the [AF area
selection mode] setting:
• Ma nua lly s ele ct an d move a single AF point
• Expand the size of an AF point
• Use a large area of AF points, and have the camera
automatically change AF point location for you
The two types of modes in which you can manually
select a single AF point to focus with are [Single-point
Spot AF] and [Single-point AF]. The four modes that
can switch automatically between multiple AF points to
capture moving subjects are AF point expansion (Manual
selection, 4 points [
selection, surrounding 8 points), Large Zone AF, and
Auto selection of AF (during AI Servo AF).
These AF Area options are explained from P. 55 – 75,
so you can select the mode best suited to your subject's
characteristics and shooting scene.
]), AF point expansion (Manual
51