Canon EOS R5 C VR Creator Kit with RF 5.2mm f/2.8 Dual Fisheye Lens - Manual (Page 275)

3.
Recompose and take the picture.
When you are to take more pictures while maintaining the AE lock,
keep holding down the <
> button and press the shutter button to
take another picture.
Note
AE lock is not possible with bulb exposures.
AE Lock Effects
Metering Mode
Selection
AF point selection
Automatic Selection Manual Selection
Exposure centered on the AF point in
focus is locked. Exposure centered on the selected AF
point is locked.
Center-weighted exposure is locked.
* When [ ] is set with the lens's focus mode switch set to < >, center-weighted exposure is
locked.
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