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The is the Preview mode. If you've disabled this feature for your Home button, you can access the Home Screen Preview by opening the Nova Settings app, selecting "Desktop", and then selecting "Home Screens". If you are returned to your home screen and nothing happens, do it again and the Preview view should appear.
Tap the Home button to return to your Home screen. Tap the Home button again to display miniature versions of all your Home screens. Tap and hold the screen you want to remove. Drag the page you want to remove to the "X" at the top of the screen.