Thanks to another forum member, but here is an easy way to get a default home screen when you press your bottom button on the S4. From any screen do a 2 finger pinch. That will bring up all the screens in a very small format. Notice there is a little "house" at the top of each screen. One of them is solid white. That is the current home screen. Just tap the house on the screen you want and it colors solid white and is the default home screen.