Back button class is set to (button-clear)

I built out the flow of my application with Ionic creator and I think I accidently hit hide back buttons. Now all of the back buttons are hidden, they are there and functional, I can click them and go back to the previous page. But the class is set to “button-clear” so the user can’t see it. I’m trying to undo this, but haven’t figure it out yet.
Any suggestions?