static bindingcontext for design time

Settings.xaml

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="CicloConnect.Frontend.Views.SettingsPage"
             xmlns:mvvm="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"             
             xmlns:vm="clr-namespace:CicloConnect.Frontend.ViewModels;"
             BindingContext="{Binding Source={x:Static vm:DesignTimeViewModels.SettingsDummyViewModel}}
             Title="Settings">