3 Col NavigationSplitView Issue

// How can I transition from the sidebar view to the contentView on iPhone?

import SwiftUI

struct Name: Identifiable, Hashable {
    let id = UUID()
    var firstName: String
    var lastName: String
    
    static var sample: [Name] {
        [
            Name(firstName: "Stewart", lastName: "Lynch"),
            Name(firstName: "Emily", lastName: "Heidrich"),
            Name(firstName: "Adian", lastName: "Lynch")
        ]
    }
}

struct ContentView: View {
    @State private var columnVisibility: NavigationSplitViewVisibility = .all
    @State private var names = Name.sample
    @State private var selectedName: Name?
     
    var body: some View {
        NavigationSplitView(columnVisibility: $columnVisibility) {
            //Sidebar
            HStack {
                Button {
                    names = names.filter {$0.lastName == "Lynch"}
                } label: {
                    Text("Lynch Names")
                }
                Button {
                    names = Name.sample
                } label: {
                    Text("All Names")
                }
            }
            .buttonStyle(.bordered)
        } content: {
            List(names, selection: $selectedName) { name in
                NavigationLink(value: name) {
                    Text(name.firstName)
                }
            }
        } detail: {
            ZStack {
                if let selectedName {
                    Text(selectedName.lastName)
                } else {
                    
                    Text("Select a name")
                }
            }
        }
    }
}

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