Guy at Walmart said that this TV would accept smart view and that I had to download the Vizio app.... sounds weird when its an ONN TV not vizio.... the TV is showing up in my smart view menu on the galaxy note 10+ phone. On the TV, under systems, there is no screen share option.
I would say the guy at Walmart didn't know what he's talking about. The Roku setting is under Settings->System->Advanced system settings->Device connect. I just tried it with my Samsung phone and my Roku 3 and couldn't get it to work, but I didn't try too hard.