At least as of 2018 (I haven't seen the driver app recently), after giving a ride, a driver is basically restricted to the passenger rating screen until they complete it. Screens like this one, if they exist, are only visible after a driver has rated a passenger.

The driver's rating of a passenger can only be changed by opening a support ticket, not in the app (https://help.uber.com/partners/article/i-want-to-change-my-r...).

If drivers did that. Uber would surely and swiftly take that out of the UI.