- Help trigger · Button
The round "?" in the top bar, in the same spot on every page (right, before the account). 32px with a 44px hit area; it toggles the help drawer and shows pressed while open. - Help drawer · Sheet
The page-help sheet (380px, below the top bar so "?" stays clickable): Summary, What you can do here, Connected to, Where the data comes from, Key terms. Loading, empty and error states. Phone: a bottom sheet.