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

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 Customizing AF FunctionsN
148
You can set either to stop the selection at the outer edge or it can cycle 
around to the opposite side in AF point selection.
: Stops at AF area edges
Useful if you often use an AF point 
along the edge.
: Continuous
Instead of stopping at the outer edge, 
the selection of AF point continues to 
the opposite side.
2
5
AF point selection movement
AF5
 
If [EOS iTR AF (Face priority)] or [EOS iTR AF] is set, the camera may 
take longer to focus than when [Disable] is set.
 
Even if you set [EOS iTR AF (Face priority)] or [EOS iTR AF], the 
expected effect may not be obtained depending on the shooting 
conditions and subject.
 
Under light so low that the EOS-dedicated, external Speedlite emits the 
AF-assist beam automatically, AF points are selected automatically 
based only on AF information.
 
Face detection may not work if the face is small or under low-light 
conditions.
With [24: Initial AF pt, 
 AI Servo AF] set to [Initial  
AF 
pt 
selected], the above setting will also work when you are selecting the initial 
AF point for AI Servo AF.