Many thanks. You are absolutely correct. I installed Avg antivirus and avg cleaner. All was well until avg cleaner suggested putting some apps into hibernation. To do so, it required my permission. I granted this and suddenly my screen turned sideways and the blue circle cursor appeared.
I managed, after chasing the mouse around the screen, to get into settings....display...screen orientation and click on " force land" and it righted itself. However, when I went back into the same settings and clicked on "normal ", the screen went sideways again. So I am not sure if the original screen rotation was in " normal" or force land. But I still have the blue circle and am getting used to it.
Yes, I could factory reset, but that would take some time with all the apps I have. And so, I will just live with the new cursor until my U22 arrives.
Thank you for your help.
Regards