I don't have your camper, but if the switch isn't on the fixture itself, it should be in the inside control panel with the slide controls, awning, scare lights, etc.
BTW, welcome to the Forum!
X 2 - switch is usually right on the light fixtures themselves, probably on the bottom edge. This is so you can switch them on and/or off when you are hitching or un-hitching in the dark, with having to go inside the trailer.
I have a 2012 Silverback 29RE and my switch for the front two led lights are located in the drivers side front compart by the water line valves on mine .hope this helps by the dump valves inside the compartment