Try long-pressing an icon/item on the home screen and dragging it all the way to the right, let it go past any existing screens and you should see a narrow "pop-out" from the right that when the icon is dragged there should create a new screen.
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Welcome to the forums. Try this, press and hold any icon on your home screen, drag it to the right until an empty screen is opened and place it there. I think the only limitation is that you can't have an empty screen with the stock launcher and you'd need a custom one like Nova.