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When I start my Tess and put her into Reverse, the below icon shows up on my display. If you touch the icon it changes to a full screen view. Not sure why. Can find no reference to it in the Manual.
I believe If you have the rear camera view displayed while you're driving forward at low speed i.e. <5mph (<8kph), the traffic cone icon appears - tapping on the icon will bring up the Parking Assist view.
You use that button to turn the "beeping" of the parking sensors off when backing up. Handy when you are on the phone and backing in to your garage or parking space and the sensors are going nuts.