It's true that vegan cheese does not melt in the same way as dairy cheese, but store-bought vegan cheese has come a long way, and most brands melt very well now. With that being said, there are a few tricks you can use to make your vegan cheese as melted as possible.  First, make sure to cook the garlic bread at 400 degrees Fahrenheit. Any lower, and it won't be hot enough to properly melt the cheese. If this hot temperature doesn't melt the cheese to your liking, broil the bread for the last couple of minutes. This will help encourage the cheese to melt even faster and make it as melty as possible.