For many years, TM included this switch, and it controlled all the lights in the rear shell. It was a safety feature. The light over the rear bed was an incandescent, and if you left the light on when you lowered the rear shell, it was muffled in the blankets and got very hot. To prevent burning something, the switch turned off the power to that light, and all the others in the rear shell at the same time. So if you decide to disable this switch, be sure you don't have an incandescent bulb in that fixture.
My TM has the same plunger switch, and I admit I'm not sure what it controls. I should check. Unlike the original, it does not control lights. My camper has an "All Lights Off" rocker switch near the entry door. Once this switch is on, all the lights operate normally regardless of the position of the plunger switch. The lights are LEDs.
Bill
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