Canon EOS R10 User Manual page 203

3.
Recompose and take the picture.
Note
AE lock is not possible with bulb exposures.
Effect of AE Lock
Metering Mode
Selection
* Center-weighted exposure is locked when [
focusing ( ).
When you are to take more pictures while maintaining the AE lock,
keep holding down the <
take another picture.
Automatic Selection
Exposure centered on the AF point in
focus is locked.
Center-weighted exposure is locked.
> button and press the shutter button to
AF Point Selection
Exposure centered on the selected AF
point is locked.
] is set with the camera configured for manual
203
Manual Selection