This Tutorial Shows how to Make Your GroovePages Navigation Menu Be the Full Width Of Your Page
By default, the GroovePages Navigation Menus (most, if not all) are styled to be no wider than 1200px (max-width: 1200px).
This means if you have a very wide screen, your Navigation Bar will not extend to the edges of the screen once it gets past 1200px.
Here is what the Navigation Block looks like normally, with a maximum width of 1200px:
And using this tutorial, here is what the Navigation Block looks like set to the full-width of your screen:
It's very easy to implement this and should only take a few minutes.
Below is the CSS code snippet to use in your page settings.