Canon EOS R5 C User Manual page 105

Note
Differences between [ ] and [
[ ] mode limits available functions and sets the AF method, metering mode, and
many other functions automatically to prevent bad shots. In contrast, [ ] mode only
sets the shutter speed and aperture value automatically, and you can freely set the
AF method, metering mode, and other functions.
Program shift
In [ ] mode, you can freely change the combination (program) of shutter speed
and aperture value set automatically by the camera while maintaining the same
exposure. This is called Program shift.
With Program shift, you can press the shutter button halfway, then turn the <
dial until the desired shutter speed or aperture value is displayed.
Program shift will be canceled automatically when the metering timer ends
(exposure setting display turns off).
Program shift cannot be used with flash.
] modes
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