Windows Runtime Via C# Now

: This tool integrates directly into Visual Studio and supports .NET versions up to .NET 9.0. You can use the Visual Studio integrated designer to build layouts, connect to SQL data sources, and preview reports without leaving your code environment.

If you are looking to report on the state of your application or code: Debug routines - Microsoft Learn

For modern Windows applications (WinUI 3 or UWP), there is no built-in "Report Designer" like there was in legacy WinForms. You typically use third-party libraries that support the .NET versions used by WinRT.