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swiftui - Navigation Title Issue

I have a navigation title for a list view. After navigating back and forth, my navigation title is missing. I am new to swiftui and unable to debug. Kindly help.

    var body: some View {
    
    NavigationView {
        
        VStack {
            
            TabView(selection: $choice,
                    content:  {
                        
                        OPListCell()

                        IPListCell()
                        
                    })
                .tabViewStyle(PageTabViewStyle())
            
        }
        .listStyle(PlainListStyle())
        .navigationBarTitle("My Patients")
        .toolbar {
            ToolbarItem(placement: .principal) {
                
                HStack {
                    Picker(selection: self.$choice, label: Text("")) {
                        ForEach(0 ..< self.choices.count) {
                            Text(self.choices[$0])
                        }
                    }
                    .frame(width: 175)
                    .pickerStyle(SegmentedPickerStyle())
                    .padding(.leading, 10)
                }
            }
            
        }
        
    }
    
}

}

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question from:https://stackoverflow.com/questions/65843937/navigation-title-issue

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