I'm currently editing Twenty Twelve theme for my site. I duped the menu as I need two menu's a main and a sub menu. I'm currently working in Firefox and can see the menu button in the top left of each menu bar - it's throwing out the menu itself making it revert to double the height. Is this normal and how do I hide the menu button when viewed in normal web browsers? I assumed the button appears when the site is viewed on a smaller device?
I'd really appreciate some help on how to get around the issue.