Adobe Illustrator CC 2015 - Manual (Page 129)

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Drawing
Last updated 6/5/2015
Note: If you lock the station point using the View > Perspective Grid > Lock Station Point option, then both the vanishing
points move together.
You can also adjust the left, right, and horizontal grid planes using the respective grid plane control widgets. The
pointer changes to a two-way arrow (
, ) when you move the pointer over the grid plane controls.
Holding the Shift key while moving the grid planes, constrains the movement to the extent of cell size.