struct ContentView: View {
   @Environment(ApplicationData.self) private var appData

   var body: some View {
      NavigationStack {
         List(appData.userData) { book in
            CellBook(book: book)
         }
         .navigationTitle(Text("Books"))
         .toolbar(.hidden, for: .navigationBar)
         .toolbar {
            ToolbarSpacer(.flexible, placement: .bottomBar)
            ToolbarItem(placement: .bottomBar) {
               Button("Show") {
                  print("Show Values")
               }
            }
         }
      }
   }
}