How to Change The Mac Finder Sidebar | Add or remove an element.
You can change or customise your Finder sidebar on your Mac or MacBook to include the folders and locations you most often use. You can click on a sidebar item to go to that location, and also drag and drop items into those locations. You can change the sidebar in Finder, Preferences, and also by dragging and dropping items into and around in the sidebar. Tags and Smart Folders can be used to make the sidebar even more useful.