public void UnRegisterNavService() { SimpleIoc.Default.Unregister <INavService>(); SimpleIoc.Default.Unregister <ICustomDialogService>(); SimpleIoc.Default.Unregister <IDatabaseService>(); SimpleIoc.Default.Unregister <INetworkService>(); ViewModelLocator.UnRegisterModels(); RegisterNavService(); var firstPage = new NavigationPage(new LoginView()); // Set Navigation page as default page for Navigation Service: navigationService.Initialize(firstPage); // You have to also set MainPage property for the app: MainPage = firstPage; // MainPage = new DashboardController(); MainPage.SetValue(NavigationPage.BarTextColorProperty, Color.White); }