Please note that official support for this menu version has now ceased. There are still plenty of users, though, and the forum is still running. Some of our long-time users may be able to help you out.
As you can see, the site nav is as wide as the page, while the example is only as wide as the text. I've got the problem that my menu is imitating the sample, and I need it to be as wide as the screen. Any Ideas on where the magic setting is?
The magic setting is in the 15th element of the menu array. Set it to 1. If you have borders around your menu items, you might want to get rid of them and just have separators between items to achieve the desired effect.