Yes. Go to Settings -> Global Settings. You can see ‘Coverage Radius’ field.
Enter the radius from your base address which all your journeys must begin or end in, then press 'Save Changes' at the bottom of the page.
For example, if you enter 10, you will only be able to accept jobs for which the pickup location, or drop off location, are within 10 miles of your base address.
If you would like to set your radius as 'unlimited', then you can leave this field blank.