I'm using Visual Studio 2015 Community with Xamarin, and I realized that when I edit XAML in designer mode (Shift + F7) I can not see the preview of it because another window with the same font is opened. I can not even see your rendering in Xamarin.Forms Previewer.
The project is properly compiled, there are no errors, and I can use it on mobile, Android VMs, and other platforms.
I also did the following:
- Enabled Tools > Options > XAML Desginer > Enable XAML Designer, and restarted VS, including varying all the options on this screen.
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I accessed View > Other Windows > Xamarin.Forms Previewer (here's the screen below):
- Use the STABLE version of Xamarin
- All NuGet packages (those required for project operation, such as Xamarin.Forms) are updated
- Newly formed computer and software installed
- Windows 10 Enterprise x64 OS, and also tested in the Pro version.