React · SwiftUI · agent guides
Sidebar
An app's side place for moving between places: sections of items with one highlight that glides to the current place; it collapses to a rail (words first, then width) with tooltips.
Use it for
- An app with several places people move between often: spaces, views, settings.
Don't use it for
- A site's sections (use the navigation menu), or a panel of properties (use a sheet or a split pane).