Dear,
Everything worked correctly with the Visual Studio 2017, both using Xamarin Forms 3.4 or 3.6, but, after update to the Visual Studio 2019, I no more can use the XAML Previewer because it is rendering my pages out of scale.
If I create a new project the pages are rendered correctly (at left on the below image), but if I copy a page from this new project and put in my project it is not rendered correctly (at right on the below image), but I cannot found how my project is influecing the XAML Previewer, this not happens in VS 2017.
Please, somebody know a clue about that?