I'm not able to find where the panel lights switch is located.
I also would like to know if it's possible to deactivate the joke view in the virtual cabin.
You can hide the yoke in the virtual cockpit by locating a click spot on the bast of the yoke and clicking on it. When you hide the yoke, you should be able to see the light switches more clearly. The panel light controls are to the left of the Yoke, where it says "dimming". You can use the mouse wheel to control those dimmers.