SwiftUI NavigationView show master on left

Question

I have some master detail in Swift UI. Here it is:

import SwiftUI

struct MenuItemView: View {
    var title: String
    @Environment(\.presentationMode) var presentationMode

    private var btnBack : some View { Button(action: {
        //if landscape just show list on the left
        //same if swipe from left
        //how to do that???


        self.presentationMode.wrappedValue.dismiss()
    }) {
        Text("Menu")
        }
    }

    var body: some View {
        Text(title)
            .navigationBarTitle(Text(title), displayMode: .inline)
            .navigationBarBackButtonHidden(true)
            .navigationBarItems(leading: btnBack)
    }
}

struct ContentView: View {
    @State private var items: [String] = ["Home", "Events", "Topics", "Latest"]

    var body: some View {
        NavigationView {
            List {
                ForEach(self.items, id: \.self) { item in
                    NavigationLink(destination: MenuItemView(title: item)) {
                        Text(item)
                    }
                }
            }
            .listStyle(GroupedListStyle())
            .navigationBarTitle(Text("TimelessToday"), displayMode: .inline)

            Text("Initial")
        }
    }
}

#if DEBUG
struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}
#endif

This is working exactly as I plan in portrait mode for any IPhone. But in landscape for IPhone 11 or for IPad in portrait I want "Menu" button when pressed to show left menu with list of items. Same like when doing swipe from left side to show it.

Can't understand how to do this.