Xcode – SwiftUI unable to restrict to landscape only

I am trying to build a landscape-only app in Xcode 13 and SwiftUI. I notice even if I have unchecked "Portrait" orientation, the app will still work in portrait mode. I am unable to force the app to work in landscape mode.

This is the Device Orientation Settings:

This is the simple hello world SwiftUI:

import SwiftUI

struct ContentView: View {
    var body: some View {
        Text("Hello, world!")
            .padding()
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

Expected:

"Hello world" rotated 90degree clockwise when device in portrait mode. Forcing user to rotate the device to landscape mode to view correctly.

Actual:

"Hello world" still renders correctly in portrait mode. Why?