MyLargeTitlePage.cs

using Xamarin.Forms;
using Xamarin.Forms.PlatformConfiguration.iOSSpecific;  
 
 namespace iOSEleven  
 { 
	 public partial class MyLargeTitlePage : ContentPage 
	 { 
		public MyLargeTitlePage() 
		{ 
			InitializeComponent(); 
			On<Xamarin.Forms.PlatformConfiguration.iOS>().SetLargeTitleDisplay(LargeTitleDisplayMode.Automatic); 
		}  
	 }
}