Gee, setting up the AF on the R5 is a complex area, there are so many different choices that fundamentally change the way the camera operates.
I'd changed so many things that, at times, I could hardly remember what settings I'd used and how they inter-related. I settled on a setup and was pretty happy with it. However, one thing that has been driving me nuts is trying to get the little white box with the arrows on the side, I could never get it to pop up. I've had the pre-focus square pop up before but it didn't seem to offer any real benefit by itself.
Eventually, today, I sat down with my camera and got the pre-focus square to come up again, however, still no arrows to the side. I went through every setting and button mapping again, trying to figure out if there was an option or setting I'd missed but couldn't find anything. I decided there must be something in my button mapping that was restricting it...
At long long last, the Eureka moment...somehow my multi controller was turned off!!! I've no idea how that happened and I guess my time with the EOS R has led me to stop using it (I hated not having it on the R and I cannot believe that I didn't even realise it had been disabled)
Anyway, happy days
The plus side is that I'm much more aware of what this camera can do now and am looking forward to using my new setup.
Thanks to all those here who have gone into the depths of the AF settings, it's really helped out.