My note 3 Pro received the Miui 10 update on Christmas Eve.
It has a few "Pie" features and I'm liking most of it.
I was getting really frustrated with it at first as the screen wouldn't auto-rotate.
After cursing and swearing off Xiaomi in future, I downloaded several apps to try and find out what was going on, then another app to force orientation.
Finally I rebooted holding the phone vertical while it loaded up, and it's all working again, phew!