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I suggest checking the documentation, but I believe that the XAML Previewer was deprecated in 16.8; use XAML Hot Reload instead.
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I opened Visual Studio today and the icon to toggle the split view in XAML mode to see the previewer for Android is missing. I have that option turned on in Visual Studio options. I also tried updating VS2019 to 16.8.3 and that didn't fix it. Neither did creating a new project or restarting Visual Studio.
I suggest checking the documentation, but I believe that the XAML Previewer was deprecated in 16.8; use XAML Hot Reload instead.