Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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Basic Shooting Operations
The <9> consists of an eight-direction key and a button at the center. 
Use your thumb to tilt the <9> in the desired direction.
 
Use it to select the AF point, correct 
the white balance, move the AF point 
or magnifying frame during Live View 
shooting or movie shooting, scroll 
around magnified images during 
playback, set the Quick Control, etc.
 
You can also use it to select and set 
menu items.
For selecting the AF area (p.106).
After pressing the <S> button, 
press the <
p> button.
 
Pressing the <S> button will make 
the AF area selection mode and AF 
point selectable for approx. 6 sec. 
(9). Then when you press the <p> 
(AF area selection) button within that 
time, you can change the AF area 
selection mode.
9
 Multi-controller
p
 AF Area Selection Button
You can also press the <S> button and then press the <B> button to 
select the AF area selection mode.