Class Diagram in Visual Studio 2019 | Class Designer Getting Started
Design, visualize, and refactor classes and other types in your code with Class Designer in Visual Studio. Use class diagrams to create and edit classes in your C#, Visual Basic, or C++ project. You can also use class diagrams to understand your project structure better or reorganize your code.
Class diagrams show the details of types, for example, their constituent members, and the relationships between them. The visualization of these entities is a dynamic view into the code. This means that you can edit types in the designer and then see your edits reflected in the source code of the entity. Similarly, the class diagram is kept in sync with changes you make to code files.

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