The sidebar on the left lists every part of the site. The section you are in
opens to show its entries. Collapse it to icons with the button at its foot; the
site remembers the choice in this browser.
This panel has a strip of tab icons down its right edge; hover over one for
its name. Guide explains the page you are on. Details, where a page has
it, lists the properties of what you are looking at. Close the panel to give the
page the full width.
Appearance, a tab in this panel, sets the colour theme, text size, density
and motion. The choice is saved only in this browser.
Without JavaScript the sidebar stays open and this panel stays at the side with
its Guide and Details open. Appearance needs JavaScript, because the choices are
saved by the browser.