Canon EOS 6D Mark II Basic Instruction Manual - Page 109

f: Selecting the AF OperationN One-Shot AF for Still Subjects AF point Focus indicator Suited for still subjects. When you press the shutter button halfway, the camera will focus only once. The AF point that achieves focus is displayed, and the focus indicator in the viewfinder will also light up. With the camera in the default settings and the metering mode set to the evaluative metering, the exposure setting is set at the same time the focus is achieved. While you keep holding down the shutter button halfway, the focus will be locked. You can then recompose the shot if desired. 107