Xcode Preview not showing a device, just the content

I am learning Swift right now and I see everywhere that people have devices as their previews but I cannot figure out how to show a device. Here is my code

struct MeetingView_Previews: PreviewProvider {
    static var previews: some View {
        MeetingView()
            .previewDevice("iPhone 11")
    }
}

And here is an image of what I see. What do I do? (The Preview on Device button at the bottom of the canvas is disabled)

I am also seeking an answer to this question - hope someone can help us.

I was having this issue, right at the top of the screen you'll see a play button, to the right of that is the name of your project. Then it's Name of Project > My Mac. If you click on My Mac you can select different devices to preview it in. Then press play and Stop. It took a few times but eventually mine seemed to switch to a phone.

https://developer.apple.com/documentation/xcode/running-your-app-in-simulator-or-on-a-device

I'm not sure if that's the correct answer but hopefully helps.

Xcode Preview not showing a device, just the content
 
 
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