Doesn't works with .netstandard 2.0 Xamarin.Forms 4.5

[michelevirgilio]

Created a default Shell project, then in the AboutPage.xaml

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
            xmlns:client1="condition:CLIENT1"
            xmlns:client2="condition:CLIENT2"
             mc:Ignorable="d client1 client2"
             x:Class="XamarinMulti.Views.AboutPage"
             xmlns:vm="clr-namespace:XamarinMulti.ViewModels"
             Title="{Binding Title}">

........
<client1:Label Text="Android only" VerticalOptions="Center" HorizontalOptions="Center"/>
..........

but nothing is shown at runtime.