The current homezone is always displayed via the colored 'polygon' in the Lev app (with the yellow outline).
Note: there are also a number of areas in the center of Rotterdam that are not part of the homezone.
With a Lev you are free to drive inside and / or outside the homezone. You do need to end your trip at all times within the Lev homezone.
If you bring a Lev outside the homezone, you can pause your trip outside the homezone (for a reduced rate). You cannot end your trip outside the homezone.
Note: If you see an option to pause your trip in the Lev app, but not to end it, chances are your Lev is outside the homezone at that time. Drive the Lev back into the homezone and then end your trip.
There are pick-up costs associated with leaving a Lev outside the homezone.