How do you reset trip mileage on 2016 c4 grand Picasso located next to cars mileage?

To reset the trip mileage on a 2016 Citroën C4 Grand Picasso, locate the trip computer button on the dashboard or the steering wheel controls. Press and hold the button until the trip mileage resets to zero. Ensure the vehicle is in the "on" or "run" position, but the engine does not need to be running while you perform this action.