I am using xamarin forms v2. 3.2.127 stable on Visual Studio 2015 Community Edition in Windows 10 Operating System. Every time I try to open the xaml, the Xamarin Forms Previewer did not show anything, just a blue box like the screenshot below. I have also tried to create new project even in the latest pre-release channel but it still the same.
After set the settings in Tools > Options > Xamarin > Xamarin. Forms XAML Previewer dialog, you need to restart the Visual Studio. If it still does not work when you create a new project, you could right click the content page, select the View Designer .
The XAML Live Preview window is available during debugging. To open it, go to Debug > Windows > XAML Live Preview. Or, select the Show in XAML Live Preview button in the application toolbar.
To open the XAML Designer, right-click a XAML file in Solution Explorer and choose View Designer. to switch which window appears on top: either the artboard or the XAML editor.
Like @jgoldberger said, the XAML previewer is still in early development. However if you are on the Xamarin Stable update channel it might be worth switching to the Beta update channel.
There have been vast improvements in the XAML previewer in the next release, which is currently on the 6th RC iteration (ie. very close to stable). This way you can at least see if the previewer improvements fix your issue. You can always return to the Stable update channel if you choose.
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