Canon EOS 7D Mark II Instruction Manual page 123

Selectable AF point
You can change the number of manually selectable AF points. If 65-
point automatic selection AF is set, the Area AF frame (entire AF area)
will be used for AF regardless of the setting below.
With a lens from Groups E to G (p.102-103), the number of manually
selectable AF points will be fewer.
Even with settings other than [65 points], AF point expansion (manual
selection
Zone AF (manual selection of zone) and Large Zone AF (manual
selection of zone) are still possible.
When you press the <S> button, the AF points which are not manually
selectable will not be displayed in the viewfinder.
), AF point expansion (manual selection, surrounding points),
3 Customizing AF FunctionsN
: 65 points
All 65 AF points will be manually
selectable.
: 21 points
Twenty-one major AF points will be
manually selectable.
: 9 points
Nine major AF points will be manually
selectable.
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