Canon EOS-1 D X Mark II Instruction Manual page 131

Select AF area selection mode
You can limit the selectable AF area selection modes to suit your
shooting preferences. Select the desired selection mode and press
<0> to add a checkmark [X]. Then select [OK] to register the setting.
The AF area selection modes are explained on pages 96-98.
The [X] mark cannot be removed from [Manual selection:1 pt AF].
If the attached lens belongs to group I, J or K, you cannot use certain AF
area selection modes even if you add a [X] in [Select AF area selec.
mode] (p.106 - 108).
3 Customizing AF Functions
: Manual select.:Spot AF
: Manual selection:1 pt AF
: Expand AF area:
: Expand AF area:Surround
: Manual select.:Zone AF
: Manual select.:Large Zone
AF
: Auto selection AF
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