Hello @CUP CUP ,
Welcome to Microsoft Q&A forum.
So, are you using this extension: C++/CLR Windows Forms for Visual Studio 2019? If yes, you can contact the author by asking questions here: C++/CLR Windows Forms for Visual Studio 2019 – Visual Studio Marketplace – Q&A.
By the way, Visual Studio 2019 indeed removed C++/CLR templates, and if you want to create a Windows Forms project(C++/CLR) in Visual Studio 2019, perhaps, there is another workaround: Create C++ Windows Forms application in Visual Studio 2017.(This is related to VS 2017 but you can refer to it)
Best Regards,
Tianyu
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