Question:After update to IOS 13, appear a circle with a dot in the centre of the screen
I was able to remove the circle in the middle by switching off the Dwell On option.
iPhone XS Max, iOS 13
That is related to Assistive Touch. You can turn it OFF by-
Open Settings ➔ Accessibility ➔ Touch ➔ AssistiveTouch and then Turn it OFF.
Axel F.