Canon EOS 80D Instruction Manual page 436

8: Custom Controls
a: Metering and AF start
When you press the button assigned to this function, metering and AF
are executed.
b: AF stop
The AF will stop while you hold down the button assigned to this
function. Useful when you want to stop the AF during AI Servo AF.
c: ONE SHOT z AI SERVO/SERVO
You can switch the AF operation. In One-Shot AF mode, when you hold
down the button to which this function is assigned, the camera switches
to AI Servo AF mode
One-Shot AF mode only while you hold down the button. Useful when
you need to keep switching between One-Shot AF and AI Servo AF for
a subject that keeps moving and stopping.
* Servo AF mode for Live View shooting.
This setting is disabled when Multi Shot Noise Reduction is set during Live
View shooting.
S: AF point direct selection
During metering, you can select an AF point directly with <9> without
pressing the <S> or <B> button.
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. In the AI Servo AF mode, the camera switches to