Default — ONE root-header row: quick-filter chips "Team" (active) / "Mine" / "Exclude AI", then the spring, then the date-range chip ("Today", no caret — it OPENS the Filters panel, same destination as the Filters button) + the Filters button. No title, no location dropdown — location lives in the Filters panel.
Team / Mine = exact instances of the leads-board quick-filter chip atom, one active at a time (Team default; both are shortcuts for the Filters panel's Included Users section). Exclude AI = a third chip of the same atom (toggles active) — control form PROVISIONAL. The date chip and the Filters button BOTH open the Filters panel (comp-analytics-filter); the date chip has NO caret (it opens the panel, not a presets popover); the location form-dropdown is RETIRED to that panel.
width shrinks → chips collapse to icon-only; date + Filters stay trailing
Narrow — chips icon-only (Team still marked active); the date chip + Filters button stay trailing
Engineer reference — RootPageHeader adaptive rows (#1833). The root-page header is a group of CollapsibleRows: on narrow widths every row item collapses to icon-only; as the row gains width, items regain their labels in a per-page PRIORITY order — not all at once. Each root page declares its own collapse priority (which controls label first). Here the Showroom/Contacts row labels Views + Add before the date chip + Filters. Other pages differ — e.g. Notifications' Inbox / Mentions segments gain labels only on wide rows. The same header strip is used on BOTH idioms (mobile .sb-mh-titlebar + desktop .sb-pagehead are one band); the collapse is width-driven, not platform-driven. Built from locked atoms only — .sb-pagehead · .sb-msel (+ --primary) · .sb-daterange (+ --icon); tokens byte-identical.