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When accessing certain windows, such as the Preferences window for Geomagic Design X and Control X, the window will occasionally appear off-screen and settings cannot be changed. To bring the window back on the screen, make sure either Design X or Control X have focus. Then on a keyboard, press and hold the Alt key and then hit Spacebar. A menu may appear on the screen: 

Windows Move Menu

Press the "M" key, which will allow the off-screen window to be moved using the keyboard arrow keys. Press and hold either the left or right arrow keys until the off-screen window is visible again.