[SwiftUI preview in RTL and LTR]

swiftUIPreviewRTL-LTR.swift

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        Group {
            ContentView()
                .environment(\.layoutDirection, .leftToRight)
                .previewDisplayName("Left to Right")

            ContentView()
                .environment(\.layoutDirection, .rightToLeft)
                .previewDisplayName("Right To Left")
        }
        .previewLayout(.fixed(width: 400, height: 200))
    }
}