My Details of MainPageViewModel in MAUI

Question

builder.Services.AddSingleton<MainPageViewModel>();
 
public class MainPageViewModel : BaseViewModel
    {
        private Plato currentPlato;
        public Plato CurrentPlato
        {
            get => currentPlato;
            set
            {
                if (currentPlato != value)
                {
                    currentPlato = value;
                    OnPropertyChanged();
                }
            }
        }
        public ObservableCollection<Plato> PlatoList { get; }
        public Plato PlatoSeleccionado { get; set; }

        public List<Plato> Platos { get; private set; }
        public ICommand SelectionChanged { get; private set; }
        public MainPageViewModel(PlatoService platoService)
        {
            PlatoList = new ObservableCollection<Plato>(platoService.GetPlatos());
            SelectionChanged = new Command(
            async () =>
            {
               if (CurrentPlato != null)
                    await Shell.Current.GoToAsync(nameof(DetallePage), true, new Dictionary<string, object> { { "Plato", CurrentPlato } });
            });
        }
    }

DetallePage

[QueryProperty(nameof(Plato), "Plato")]
    public class DetallePageViewModel : BaseViewModel
    {
        private Plato plato;
        public Plato Plato
        {
            get => plato;
            set
            {
                plato = value;
                OnPropertyChanged();
            }
        }
        public ICommand BackCommand { get; private set; }
        public DetallePageViewModel()
        {
            BackCommand = new Command(
                async () => await Shell.Current.Navigation.PopAsync());
        }
    }

    <VerticalStackLayout>
        
        <CollectionView ItemsSource="{Binding PlatoList}" SelectionMode="Single" 
                            SelectionChangedCommand="{Binding SelectionChanged}"
                            SelectedItem="{Binding CurrentPlato}">

            <CollectionView.ItemTemplate>
                <DataTemplate x:DataType="model:Plato">
                    <VerticalStackLayout Spacing="10" Margin="10" Padding="10" BackgroundColor="Transparent">

                        <Label FontSize="Medium" Text="{Binding Nombre}"  />
                        <Label FontSize="Medium" Text="{Binding Precio, StringFormat='{0:C}'}"  />

                    </VerticalStackLayout>
                </DataTemplate>
            </CollectionView.ItemTemplate>
        </CollectionView>

    </VerticalStackLayout>

MainPage.xaml.cs

public partial class MainPage : ContentPage
{
	public MainPage(MainPageViewModel mainPageViewModel)
	{
		InitializeComponent();
		this.BindingContext = mainPageViewModel;
	}

}

AppShell.xaml.cs

public AppShell()
	{
		InitializeComponent();
		Routing.RegisterRoute(nameof(DetallePage), typeof(DetallePage));
	}