As Relie stated, there is usually a switch near the kitchen sink area or the bath sink on some models.
Once the camper has water in the fresh water tank, the pump will fill the camper lines with water build pressure and then the pump will shut off by itself when the pressure rises enough. And it will cycle on and off as needed to keep the pressure built up as you use water.
If you run the pump a lot with no water in the tank, or it pumps the tank dry, that constant running with no water can harm the pump long term. It sounds like it was turned on by accident. Yes, shut it off if you are not using it.
Hope this helps
John