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Is there a way to resize a window (like such that it will span multiple monitors on OS X 10.9? This was possible in earlier versions of OS X, and I'm missing it.

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up vote 2 down vote accepted

If you go into System Preferences and open up the Mission Control panel, there's a checkbox labelled "Displays have separate Spaces". If you uncheck this, you can open a window that spans multiple monitors at once, but do note that all multiple monitor support will revert to the pre-Mavericks behavior as well.

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