Hello,
There has been no XAML Previewer in Xamarin.Forms.
It's recommended to use Hot Reload in Xamarin.Forms to view the changes of XAML file.
when you save your XAML file the changes are reflected live in your running app. In addition, your navigation state and data will be maintained, enabling you to quickly iterate on your UI without losing your place in the app.
Please refer to XAML Hot Reload for Xamarin.Forms.
Best Regards,
Alec Liu.
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