Hello,
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To use the xamarin, we need to install the the Mobile development with .NET workload first on the VS installation screen. Then you could select the Mobile App (Xamarin.Forms) template to create a Xamarin project.
Here are the related docs, you could refer to:
https://learn.microsoft.com/en-us/xamarin/get-started/installation/windows
https://learn.microsoft.com/en-us/xamarin/get-started/quickstarts/
Best Regards,
Jarvan Zhang
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