I have a friend that has a T61 Lenovo Thinkpad. He was typing and claims that he hit some unknown key or key combination and the screen shrank and now has a black border around it so that the display area is not filling the screen edge to edge. I don't have the laptop in front of me, but I had him try to change the resolution and toggle the external display function keys, neither of which worked.
Does anyone know how to switch this back to full screen?

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