Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 531)

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Limit AF areas
You can limit the AF areas available to the areas that you normally use. Select available AF
areas and press the <
> button to add a checkmark [ ]. Select [ OK ] to register the
setting. For details on AF areas, see AF Area .
Caution
The [ ] mark cannot be cleared from all items at the same time.
Note
An asterisk to the right of [ : Limit AF areas ] indicates that the default setting
has been modified.
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