I know I can move a copy of an app onto my home screen, but what I'd like to do is move my apps from one app screen to another, in order to arrange them in a way which makes sense to me: for example, all the music apps on one line of the same page. As it is now, I have four app screens, three of which are only about half filled, and the fourth almost completely filled, and I know if I install another three or four apps, the software will start another page rather than putting the apps on unused space on any of the first three screens. Is there a way to force apps from one app screen to another?