Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 532)

AF area selection control
You can set how AF area selection methods are switched.
[ ] →M-Fn button
Press the < > button, then the < > button. Each press switches the AF area.
[ ] →Main Dial
Press the < > button, then turn the < > dial to switch the AF area.
Note
When [ →Main Dial ] is set, use < > to move the AF point horizontally.
Multi-controller sensitivity in AF point selection
You can adjust < > sensitivity, which applies to AF point positioning.
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