Here is the default code of the SwiftUI project template in XCode 12.0.1    var body: some View {     List {       ForEach(items) { item in         Text("Item at \(item.timestamp!, formatter: itemFormatter)")       }       .onDelete(perform: deleteItems)     }     .toolbar {       #if os(iOS)       EditButton()       #endif       Button(action: addItem) {         Label("Add Item", systemImage: "plus")       }     }   } By default, the Edit button and the Add Item button don't appear on the preview. I have to wrap the List in a NavigationView before the Edit button appears.    var body: some View {     NavigationView {       List {         ForEach(items) { item in           Text("Item at \(item.timestamp!, formatter: itemFormatter)")         }         .onDelete(perform: deleteItems)       }       .toolbar {         #if os(iOS)         ToolbarItem(placement: .automatic) {           EditButton()         }         #endif         ToolbarItem(placement: .automatic) {           Button(action: addItem) {             Label("Add Item", systemImage: "plus")           }         }       }       .navigationTitle("Main List")     }   } I've wrapped the buttons in ToolbarItems so that they can be positioned. At this point, the Add Item button is still not visible on the screen. It's only if I change it to something like ToolbarItem(placement: .principal) that it would be visible. Any leads as to why the automatic positioning is hiding the Add Item button?