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Set the display to 3D mode. That means perspective and the possibility to rotate are turned on. Return to 2D mode by *d2 * - 2D mode graphics. Keyboard Shortcuts 2 and 3 or the 2D/3D icons on the main toolbar are alternative ways to flip between 2D and 3D mode.
See also
d2 - 2D mode graphics, d23 - 2D and 3D mode switch, osc - Ortogonal scale, ssc - Self scale of data