Canon EOS R5 Advanced User Guide - Page 111

Note Differences between [ ] and [ ] modes [ ] 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. 111