4411 app:
1. Click on account in the app.
2. Click on "Vehicles".
3. Select the license plate you wish to disable.
4. Slide the bar at "Off-street" to the left.
My.4411.be
1. Surf to mijn.4411.be and sign up
2. Click on "My cars"
3. Turn off "Off-street" for the desired license plate