The Default bar style
Where to find it. Settings › People and labels › Default bar
style.
The choices. Full bar, Narrow bar (with name, or no text),
Line (inline label, or no label), and Stub (a short line at birth,
with or without a label). Stubs apply only to people with no visible
partner or children.
Branch-ending style. A second rule for terminal siblings: people with
no spouse, partner or child shown in this TreeLine. With Only when all
siblings are terminal ticked, it applies only when every sibling in the
group is terminal; unticked, to each terminal sibling on their own.
Shape, not fill. This is each person's shape. How bars are filled is
Bar style in Appearance.
What to expect. People you have set individually keep their own
choice; Use TreeLine default on a person returns them to this.