Hiding Sub-Pages in Menu

Hi,

I’m using the art-magazine theme, and sub-pages show in the menu bar just like main pages. Is there a way to suppress this behavior and not show the sub-pages in the menu?

I have seen other themes that handle this more elegantly by using nested drop-down menus, but I’m trying to avoid that route as well. I just think nested menus are hard to use and I have another way of displaying them in-page.

Thanks