Focus point display

I've been communicating with Nina Baily about this issue. She wrote the massive, informative and detailed PDF, "Understanding the Canon EOS R5", updated for the latest firmware revision. With regard to back button focusing, she wrote the following to me, which I am sharing with her permission:
BBF causes more problems than it solves! If you press it and let go you are not licking the AF as some claim you are not focusing at all! So there is no focus lock hence no AF point shown as it’s not focusing and no exposure lock for the same reason! It’s one of the many reasons why I don’t use or recommend BBF. It’s not used much with the R5 or R6 as the camera finds and stays on the subject so not so much point in using it. I have always preferred a half pressure in the shutter button and use the right AF mode for what I am shooting.
 
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