Display settings
How the tree view draws your nodes, which way it runs, and what the paged export prints onto. These are yours and apply to every project. Nothing here draws a tree — the tree view reads these settings.
Appearance
The colors the app itself is drawn in — its buttons, panels, tables and headers. Your status colors are your data and never change with this; the Statuses page is where those live.
This one is remembered by this browser rather than by your account — a rendering preference of this screen, like a zoom level. It will not follow you to another machine, and anyone else signing in on this browser sees the same choice. It saves the moment you pick it; there is nothing to Save above for it.