Use folders in the Dock on Mac
The Dock on your Mac comes with a Downloads folder, the default location for files you download from the internet, receive as attachments, or accept using AirDrop. It can appear in the Dock as a blue folder with a download symbol or as a stack of files. You can add other folders to the Dock for easy access.
Expand or collapse a folder in the Dock
On your Mac, do any of the following:
Expand a folder: Click the stack or folder in the Dock. When the stack or folder’s expanded, click any item to open it. To open the folder or stack in the Finder, click Open in Finder.
Collapse a folder: Click anywhere on the desktop or click the stack or folder in the Dock.
Change the appearance of a folder in the Dock
On your Mac, Control-click the folder in the Dock, then do any of the following:
Display it as a folder or stack.
Sort its contents by name, date added, date created, or another sort order.
View its contents as a fan, grid, or list.
You can also use stacks to organize the files you keep on the desktop. See Use desktop stacks.