Canon EOS R5 C VR Creator Kit with RF 5.2mm f/2.8 Dual Fisheye Lens - 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 [ / / ], the exposure
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 ] ( ), you can set whether or not to
lock the exposure (AE lock) once subjects are in focus with One-Shot AF.
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