Prism.Forms App.xaml

App.xaml

<?xml version="1.0" encoding="utf-8" ?>
<prism:PrismApplication xmlns="http://xamarin.com/schemas/2014/forms"
                        xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                        xmlns:prism="clr-namespace:Prism.Unity;assembly=Prism.Unity.Forms"
                        x:Class="MyApp.App">

  <prism:PrismApplication.Resources>
    <ResourceDictionary>
      <Color x:Key="backgroundColor">#33302E</Color>
    </ResourceDictionary>
  </prism:PrismApplication.Resources>
  
</prism:PrismApplication>

App.xaml.cs

using Prism.Unity;

namespace MyApp {

    public partial class App : PrismApplication {

        protected override void OnInitialized() {

            InitializeComponent();
            NavigationService.Navigate("Main");
        }

        protected override void RegisterTypes() {
            Container.RegisterTypeForNavigation<Views.Main>();
        }
    }
}