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?

Change screen settings back.

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