How to select single elements in swiftui's Canvas preview?

I know that cmnd-click can select elements in the Canvas preview window. But often, when there are many elements inside NavigationView, cmnd-click will select all of this.

Example code:

NavigationView {
  List {  
  DateView()

  Picker(selection: $transactionType, label: Text("Picker")) {
  Text("All").tag(0)
  Text("Income").tag(1)
  Text("Expenses").tag(2)
  }.pickerStyle(SegmentedPickerStyle())
  .padding()

  ForEach(0 ..< 12) {item in
  NavigationLink(destination: TransactionsDetailsView()) {
  HStack(alignment: .top) {
  Text("29/08/2019")
  Spacer()
  VStack(alignment: .trailing) {
  Text("+ 1 500 THB")
  .fontWeight(.heavy)
  Text("morning")
  }
  }
  }
  }
  .navigationBarTitle("Transactions")
  }
  }

I come from web dev background, so I assumed that I could select each of the elements in Canvas. The same in web inspetor in Safari. Am I wrong? Or is there a way of selecting more details on Canvas?