Canon EOS 6D Mark II Instruction Manual page 306

Selecting the AF OperationN
One-Shot AF for Still Subjects
Suited for still subjects. When you press the shutter button
halfway, the camera will focus only once.
When focus is achieved, the AF point will turn green and the beeper
will sound.
The focus remains locked while you hold down the shutter button
halfway, allowing you to recompose the image before taking the
picture.
When the drive mode is set to <o> for high-speed continuous
shooting, the maximum continuous shooting speed is approx. 6.5
shots/sec.
When the drive mode is set to <i> for low-speed continuous
shooting, the maximum continuous shooting speed is approx. 3.0
shots/sec.
When an external Speedlite is used, the continuous shooting
speed will become slower. Regardless of the <o> and <i>
settings, the maximum continuous shooting speed will be approx.
1.7 shots/sec.
If [54: Beep] is set to [Disable], the beeper will not sound when focus is
achieved.
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