Swift UI sidebar in iPadOS 14

Hi, I am trying to test the new iPadOS 14 feature: sidebar. However I cannot find any good implementation example code. I want to make the navigation in sidebar, which will for example control the ShowDetail View, and from the ShowDetail View I can dig deeper in EditDetail View. When I try this code:

Code Block struct iPadSidebarView: View {
    var body: some View {
        NavigationView {
            Sidebar()
            ShowDetail(whichRow: "some starting text")
            EditDetail()
        }
    }
}
struct Sidebar: View {
    var body: some View {
        NavigationView {
            List(1..<10) { i in
                NavigationLink (
                    destination: ShowDetail(whichRow: "Row \(i)"),
                    label: {
   	                   Text("Row \(i)")
                    })
            }
            .listStyle(SidebarListStyle())
        }
    }
}
struct ShowDetail: View {
    var whichRow: String
    var body: some View {
        Text (whichRow)
    }
}
struct EditDetail: View {
	   var body: some View {
        Text ("only for start")
    }
}

Code Block
struct iPadSidebarView: View {
var body: some View {
NavigationView {
Sidebar()
ShowDetail(whichRow: "some starting text")
EditDetail()
}
}
}

struct Sidebar: View {
var body: some View {
NavigationView {
List(1..<10) { i in
NavigationLink (
destination: ShowDetail(whichRow: "Row \(i)"),
label: {
Text("Row \(i)")
})
}
.listStyle(SidebarListStyle())
}
}
}

struct ShowDetail: View {
var whichRow: String
var body: some View {
Text (whichRow)
}
}

struct EditDetail: View {
var body: some View {
Text ("only for start")
}
}

the sidebar is living its own life, showing me ShowDetail View in itself, but ShowDetail View remains unchanged all the time with starting text.

Is there a code example of smoothly working sidebar navigation for iPadOS 14 somewhere?