Try looking for "Doors & Locks" or "Comfort & Convenience" then select lights from within that sub menu. There could be a pulldown menu, if so swipe down from the very top of the screen. Look for a light bulb icon, tapping this,will immediately kill all interior "polite" lighting.
Look at the button, directly on the light or on the console above the rearview mirror. There.is usually a button marked "Door" or "Off". If the physical button is clicked to the on position the radio software will be locked out and won't show the toggle switch because the physical switch is forcing the circuit open..
Otherwise, surely there's a binder on board there somewhere with operating intructions for the infotainment center.