Can anyone help me hide/remove a button?

[havoxx]

I was curious if anyone knew how to remove a button in my screenshot, that button that changes between that first action bar? I've never change that bar, not in my whole time playing wow, and I notice, those buttons are old and cumbersome, is there a way to remove those buttons?(Just an FYI, this is a mod of my skin for my RL best friend).