Shape panel
With a shape that has properties of its own

A heptagon selected and the Shape panel, with the sides and the offset

When it appears

With a shape that has properties of its own. The rows depend on the shape.

Fields

FieldWhat it does
Cornerrectangle: the corner radius. The icon at the end opens the four corners, one row per corner with its icon: touch one and they take over; moving the single slider makes them equal again
Sidesregular polygon: the sides
Offsetrectangle, circle, ellipse, polygon, path, boolean: the hole (positive) or the outward frame (negative)
Joinpath and boolean: how the eroded outline closes at the corners
Radius / Start / Sweeparc: radius, start angle, sweep
Piearc: open or pie slice — the same geometry expressed in two ways
Operationboolean: unite, subtract, intersect, exclude, divide — you change it without redoing it
Simplifypath: the simplification tolerance; on release it is written and returns to zero
Pointspath: how many points; while dragging Simplify, before → after

The arc

An arc is recognized by the shape of its geometry, not by its type: it is a path made of a single arc.