The default section for "Next Up" on the webUI is section 3.
The following code hides that section:
Code:
.section3 {
display: none;
}
Just add that to the CSS section in the dashboard to make it apply to everyone on the server.
This is not a proper solution though as your users can always change the order of what appears in each section, resulting in the CSS code hiding whatever they moved to section 3.
If they know the CSS for it, they can simply bring it back into view too.