Check the manual for that back radio, or access it online. The controls aren't intuitive. It will tell you how to turn the display off, too, which is good info.
My 2016 Vegas 25.2 turns the front radio off with the Use/Store button. If you continue to have issues with battery drain, you might install a cutoff switch on the house batteries. BTW, we have had zero problems with the stock (Harris) batteries, knock on wood.
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