EOS R5 Mark II pre-continuous shooting on off with M-Fn button
EOS R5 Mark II includes the ability to capture images from the fractions of a second before you actually press the shutter fully down. This is called pre-continuous shooting and can capture up to 15 frames, each one is saved as an individual file in RAW or JPG/HEIFF as per your camera settings. Wildlife and sports photographers have found the feature helpful, but wanted a simple way to turn it on and off. I found a way to do that.
I also think this will work for the EOS R1 too, but don’t have a camera in my hands yet to prove it.