(ddd.info)Automatic Layout

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7.3.6.4 Automatic Layout
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You can layout the entire graph as a tree by selecting `Data => Layout
Graph'.  The layout direction is determined from the display placement
(Note: Placement) and from the last rotation (Note: Rotating the
Graph).

   Layouting the graph may introduce "edge hints"; that is, edges are
no more straight lines, but lead to an edge hint and from there to their
destination.  Edge hints can be moved around like arbitrary displays.

   To enable a more compact layout, you can set the `Edit =>
Preferences => Data => Compact Layout' option.  This realizes an
alternate layout algorithm, where successors are placed next to their
parents.  This algorithm is suitable for homogeneous data structures
only.

   You can enforce layout by setting `Edit => Preferences => Data =>
Automatic Layout'.  If automatic layout is enabled, the graph is
layouted after each change.