That's not a bug, it's intentional. I don't think many would want to play a game they couldn't see all of.
If you want to get it in a window that is larger than your physical screen, then I guess the only thing you could try would be to activate any 'virtual desktop' option in your graphics card, that allows your whole desktop to be a higher res than your viewing window. That should let you run it windowed at a res larger than your physical screen.
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