On your Mac, use the Finder (identified by the blue icon with the smiling face) to view, organize and access almost everything.| Apple Support
In the Finder on your Mac, hide, show, or resize the sidebar, and change or rearrange its contents.| Apple Support
On your Mac, customize Finder windows and tags, change how filename extensions are shown, and set options for the Trash.| Apple Support
Finder sidebar| Apple Support
Represented by the blue icon with the smiling face, the Finder is the home base for your Mac. You use it to organize and access almost everything on your Mac, including documents, images, movies, and any other files you have.| Apple Support