Thank you very much for your answer.
In my case, this symbol for the factory reset with the cloud and the arrow pointing upwards is not available in the app for the worker (bottom right in the square in which the worker is displayed). That's why I don't know how to reset the worker.
Is there an option in the current Avalon Family app?
I have searched through all the options and unfortunately have not found anything.
Or is there a way to do a factory reset on the worker itself?