xamarin remove title bar

NavigationPage.HasNavigationBar="False"

//ex MainPage.xaml

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                xmlns:local="clr-namespace:APPNAME" x:Class="APPNAME.MainPage" BackgroundColor="#edfffb" NavigationPage.HasNavigationBar="False">