How do I change "Use dynamic ports" -> False?

This is not a test project property therefore you don't see it in the Test Studio. When you use the ASP.NET Development Server that comes with Visual Studio to run a file-system based Web site, by default, the Development Web server is invoked on a randomly selected port for localhost. You do have the option within the ASP.NET project in Visual Studio (use dynamic ports property ) to control which port is used when using the built-in development server.

So just go ahead and change it in the VS. 

Please check out this article also.

In order to help you best please elaborate a bit more on your scenario. What exactly problems are you facing?

Thank you for your cooperation.