I have a solution with some projects like an WPF app, a .net class library and a console program. I have just added a new Blazor project. I chose the “Blazor Web App” with interactivity WebAssembly and location per component. The template generated a two projects. One with the name I gave, and one with the “Client” suffix.
When I hit play in Visual Studio it does everything from compile to starting the host and opening my browser so that I see the beautiful “Hello World” site.