A drop off fee applies when you end your trip in drop off zones (marked "Zone A" or "Zone B" on the Home Area map).
Drop off zones are part of the Home Area and are located a little outside the city centre. The drop off fee does not apply if you start and end your trip within the same drop off zone. The drop off zones and fees are marked on the Home Area map of the chosen city.
See your Home Area's drop off zones and fees here:
Vienna Home Area
Copenhagen Home Area
Paris Home Area
Budapest Home Area
Amsterdam Home Area
Madrid Home Area