Phones always stack. The first card is open. Icons sit in a dock under the card—tap another icon or swipe to change. The current dock icon does nothing if you tap it again.
Stacked layout is always on at 767px and below. Optional Stack on MD can force the same layout on tablets. Swipe does not loop back to the first card. Dock icons meet a 44×44 tap target.
Style → Stacked Layout → Margin Top / Margin Bottom (default 25px) sets the gap above the card and above the dock.
