you can remove it thru Muffin Builder tool. Just go to page edition and under Page Options section you have Muffin Builder tool where the whole content is.
I am in the muffin builder and I don't see what you are describing.
Under options I see One Page, Subheader, Content, Custom Layout, Custom menu... all of those are off. Custom Layout says Theme Options, but when I click on that nothing else is there. Custom menu is set to default.
Comments
you can remove it thru Muffin Builder tool. Just go to page edition and under Page Options section you have Muffin Builder tool where the whole content is.