Answer based on https://stackoverflow.com/a/77610649/8218659, but have a problem in Xcode 16 and higher of iOS 17 'Preview(_:traits:_:body:)' is only available in iOS 17.0 or newer

solved:

@available(iOS 17.0, *) // <- Here add
#Preview(traits: .landscapeLeft) { //<- Here
    ContentView()
        //.previewInterfaceOrientation(.landscapeLeft) //<- no longer work
}