How can I open xaml designer?

Question

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In this document, a user can open designer by right-clicking the xaml file, and choose View Designer. But, there is no command in the tooltip. How can I activate the designer?

I use Blend for Visual Studio, Community 2019, version 16.9 preview 5, for WinUI 3.0.

Answer 1

As the support page for WinUI 3 points out, there is currently

No XAML Designer support