@fabiux Maybe there is some hidden widget in the lockscreen. Why don't you disable the Google calendar app from the settings?
@toad no way since it's pre-installed. And - more important - no reason why GCal should start after a phone call (Phone is a Google app too, of course).
Anyway, I will survive with this...
@toad : I did it for other apps, no way for Google stuff (Xiaomi Redmi 9).
@fabiux 😟