Atlas Layout
Atlas Layout gets the separate leaves of an atlas ready to use: it straightens each one along its spine, names and types them, and lays them out. Wire the leaves from Atlas Source into its first input, Geometry; it finds their spines and hulls from that geometry, so the Skeleton and Hulls inputs can stay empty. Atlas Wizard runs it as its last step.
Selection
Group limits the node to some of the leaves. Name sets the name the leaves get (the node's name by default). Type labels them Leaf, Twig or Custom; for Custom, type your own in the field beside it, which is greyed out otherwise.
Layout
Display Alignment picks how the leaves sit: Distributed (the default) spreads them out side by side, and Overlayed stacks them on top of each other.
Straightening
Straighten (on by default) straightens each leaf along its spine. Drop-Off and the Advanced settings under it tune the straightening, and their defaults suit most atlases.
Status
The atlas nodes are experimental, and their parameters may change.