DisplayStyle.REPLACE means that the card is shown by replacing the view of top card in
the card stack.
DisplayStyle.PEEK mean that the header of the card appears at the bottom of the
sidebar, partially covering the current top card of the stack. Clicking the header pops the card
into the card stack. If the card has no header, a generated header is used instead.
DisplayStyle only works for card returned from contextual trigger function.
Show the card header at the bottom of add-on content over existing content.