default appears in the center, and displayed all by default,
together with a reasonable font-size for the labels. (bad cases see below)
default view:
not showing all.
scaling to show all:
font size too small, it is not easy to recognize the text;
circle can be larger, given the spacing. (programming calculated)
(I know all are configurable, and settable by users in the right panel. BUT, we should give a good enough view initially.)
List some but not limited to:
default view:
scaling to show all: