Scampi sauce is usually very thin because it consists mainly of butter and white wine. If you prefer a thicker sauce, there are several different ways to thicken it. I like to add parmesan cheese to the top of my noodles and mix it around in the sauce before serving. The cheese helps soak up some of the butter and adds excellent flavor. You could also create a small slurry of cornstarch and water and add to your sauce for the last minute or so of cooking. This will thicken your sauce considerably. Another option is to add a bit of heavy cream to your sauce. This makes the sauce richer and thicker.