Canon MARK IV User Manual (en)

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Select one of the 45 AF points to autofocus. Manual selection enables 
you to select one of the 45 AF points. And automatic selection has 
the camera automatically select one of the 45 AF points.
1
Press the <S> button. 
(9)
X
The current AF point will be displayed 
in the viewfinder.
2
Select the AF point.
 
Use <9> or turn the <6> or <5> 
dial.
 
The AF point selection will change in 
the direction you tilt the <9>.
 
Pressing <9> straight down selects 
the center AF point. Pressing it 
straight down again sets it to 
automatic AF point selection.
 
If all the peripheral AF points light up, 
automatic AF point selection will take 
effect.
S
 Selecting the AF Point
Selecting with the Multi-controller
When the EF70-200mm f/2.8L USM is used with an Extender, use the 
center AF point only. The other AF points may cause a focusing error.
When switching to a vertical AF point, two AF points might light up. In such a 
case, shooting will proceed with the two AF points automatically selected. 
With two AF points selected, when you switch to a left or right AF point, only 
one AF point will be selected.
Automatic selection: 
 AF
Manual selection
: SEL   (Center)
SEL AF (Off center)
COP
Y