The Rotation checkbox determines whether the graph layout can be rotated when in plan mode. By default it is unchecked.
You can enter plan mode when displaying a graph by selecting
Enter Plan Mode
from the context menu. If rotation is enabled and the plan is smaller than the graph, you can rotate the plan by holding down the
key and moving the mouse left or right.
LispWorks IDE User Guide (Unix version) - 25 Nov 2011