Stacks (Mac OS)

Stacks are a feature found in Apple's macOS, starting in Mac OS X Leopard.

In the initial release of Leopard, Stacks could be shown two ways, in a "fan" or a "grid".

[1] This list view allows folder icons to display their contents in pop-out side menus.

Originally, if the fan view was too long to fit within the screen, it was automatically displayed as a grid.

After the update, the top item in the fan would allow the user to open the folder in a Finder window.