The four forms

One order and one split can be laid out four ways. The form picker says it in a line each:

Form	In a line	Sort means	Split means
Free	Placed by their connections. Pick a form to lay the canvas out by its values instead.	—	—
Rows	Along a ruler left to right, split into lanes top to bottom.	position along a ruler	a lane per category
Rings	The first in the middle, the rest in rings outward, split into wedges.	distance from the centre	a wedge per category
Spiral	One line wound out from the centre, in order: follow it from first to last.	position along the spiral	a spiral (island) per category
Stacks	Columns standing on a baseline, one per value: how many, at a glance.	a column per value or stretch	a column per category (unsorted) or a band within each column (sorted)

Rows

A ruler above the lanes with tick labels: round numbers when by value, each run of equal values otherwise, as many as fit. Its name pill at the left flips the direction (an arrow shows which way); a range pill before it shows a kept range with × to clear it. The ruler sticks to the top of the canvas when scrolled past, over a soft strip.
A lane band per category, alternating shades, with a name pill at its top left (colour dot, name, count). A lane whose nodes are all filtered out collapses to a thin dashed strip with “12 hidden”, struck through, to bring it back.
Nodes on the same value stand one above another, 64 points apart, room for a name between them.
Unsorted but split, lanes are grids of cells 200 points wide, each with a node and its name.
On a paged answer a gold Next 25 pill waits just past the last node on the ruler.

Concentric rings shaded in turn; the first node (or nodes) in the middle, then one ring per value or stretch outward. Ring names run up the twelve o’clock corridor (“1948–1959 · 12”); click one to keep only that ring, again for all.
Split, the rings are cut into wedges, one per category, named round the rim. Within a ring, nodes turn toward what they’re connected to in the rings inside.
The ring with no value is muted and only informs.
The header pills (range, “Year · lowest first, from the centre”) sit at the top left.

One line wound out from the centre, in order. Each turn where the line crosses twelve o’clock gets a pill: the value reached by then and “first 12”; click it to keep only what’s inside that turn.
Split, one spiral per category (an island), named above it; islands stand in a row when the categories’ order means something (enum options, yes/no), or pack together biggest first (types).
Arranged around a node, the node stays in the centre whatever the sort.

Columns standing on a baseline, a soft bar behind each, the count over its top.
Sorted: one column per value or stretch; the baseline is a ruler with labels under it, and dragging along it keeps a range; split as well, each column is banded by category, with the categories named in a row over the tallest column.
Unsorted: one column per category, named under each.
A collapsed column (filtered out) is a dashed outline on the baseline.

In Rings, Spiral and Stacks every node has an exact place and the forces are off; in Rows the forces only keep nodes apart within a lane.