Why is one project in my solution bold

Question

In my solution, I have one project whose name is bold.

Why is ErrorHandlerLibrary bold?

Answer 1

This is because for whatever reasons, for debugging or release purposes, Visual Studio has chosen that project as your Startup Project. These projects run automatically when starting the Visual Studio debugger. This also means that you have the option to run multiple projects when the debugger starts. To read more, check Microsoft's documentation.

Answer 2

The project that is started when starting the debugger is emboldened. If you want to change it, you can right click and set a different as the start-up project