Sets the default X coordinate (horizontal) of the Display Manager's upper left corner if the Display Manager is not in full screen mode.
Related Variables: To set the Y coordinate of the Display Manager's upper left corner, use the DispMgrY variable.
To set the height of the Display Manager, use the DispMgrHeight and DispMgrWidth variables.
Section: System
Default: DispMgrX = 0
*No restart required (Settings.Dynamic property)
