essential-ui-kit-for-xamarin.forms/EssentialUIKit.UWP/App.xaml

<Application
    x:Class="EssentialUIKit.UWP.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:EssentialUIKit.UWP"
    RequestedTheme="Light">

</Application>