That's kind difficult to do, I'd have to make a video.
In simpler terms... when I set the NavBar width.... to 770 ( the page width ) it does not stay 770px it jumps back to 766px.

Anyone can re-create this... just drag a NavBar onto the page.... and then try to resize it to your page width.
You'll see it does not work in XARA.. which means you always have a NavBar which does not fit.... unless you re-create every page as grouped graphics.

If you can help... that will be great... if can't get this to work I'm going to ask for money back. ( Building menu's all day long is not my idea of getting a site up when using a template ).