Layout

The page frame: Header, Sider, Content and Footer, with a sider that collapses and reports when it does.

Tokens

Set these under components.Layout in your token file, or pass them to ThemeScope to change one region of the page.
Component Tokens
Layout's component tokens, with the values the default seed produces. Set one and it applies to every Layout under the provider.
Global Tokens
The global tokens Layout reads. Set one under components.Layout to change it for Layout only, or at the top level to change every component.