Canon EOS R5 C User Manual page 271

Center-weighted average
The metering across the screen is averaged, with the center of the screen weighted more
heavily.
Note
By default, the camera will set the exposure as follows.
With [ ], holding down the shutter button halfway locks the exposure value (AE
lock) after the camera focuses with One-Shot AF. With [
value is set at the moment the picture is taken (without locking the exposure value
when the shutter button is pressed halfway).
With [ : AE lock meter. mode after focus] (
lock the exposure (AE lock) once subjects are in focus with One-Shot AF.
), you can set whether or not to
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/ / ], the exposure