Canon EOS R6 Advanced User's Manual page 278

3.
Select [Movie auto exposure].
4.
Focus on the subject.
Before recording a movie, focus with AF (
By default, [
camera always keeps focusing (
When you press the shutter button halfway, the camera will focus with
the current AF method.
: Movie Servo AF] is set to [Enable] so that the
).
278
) or manual focus ( ).