Why am I unable to select a Target Framework in Visual Studio 2019?

Question

This is when creating a new C# WinForms project. I have tried uninstalling, reinstalling, and seemingly everything I could find online.

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Other frameworks are installed and are selected appropriately in the Visual Studio installer:

Installed targeting packs
Selected SDK's in Visual Studio Installer
Selected Frameworks in the Desktop Development section of Visual Studio Installer

Answer 1

I think this is because you've created a 'SDK' type project. You need to use the Windows Forms App (.NET Framework) project to target the older frameworks.