How do I disable the "Pandora accessory" screen?

Post a screen shot. I’m not sure what you’re talking about.

You’re paired with that device via Bluetooth and that screen won’t go away?

Normally if you see that, all your controls are done through the accessory device.

Right, you would assume the car would have those controls however I didn't see them. And since I'm in the passenger seat I'd rather have the controls (change stations) in my hands on the phone.