Optional ReadonlyactionsReadonlychildrenOptional ReadonlyclassOptional ReadonlycollapsibleLets the user fold the section away by clicking its title line. Sections start expanded: these pages exist to be browsed, so nothing is hidden until the user chooses to hide it.
Optional ReadonlycountNumber of entries in the section, shown next to the title. Lets a long list state its size without being scrolled, which is the point of folding it in the first place.
Optional ReadonlyforceKeeps the content visible regardless of the user's fold state, e.g. while a filter is active — a match inside a folded section would otherwise be silently unreachable.
Optional ReadonlysubtitleOptional short subtitle shown next to the title.
Optional ReadonlytitleGroup title. Omit for an untitled group of rows.
Optional actions shown on the title line, aligned to the right (e.g. a toolbar of "copy all" buttons).