A zone is where you will start your Minimum Guarantee slot.
However, it can happen that you get a job request outside of that zone.
If the pick-up is within the maximum distance, you should ACCEPT this job, even if it's not your zone!!
Having support cancel it will invalidate your Minimum Guarantee for this slot.
If a job takes you outside your zone, you have 1.5x the amount of time you spent on a job out of your zone to go back to your zone. See more information on this here.