I clicked on my finder but I saw the application, library, system, and user. I checked out online and I saw air dock, all the files iCloud, application, desktop, document, download. How do I change it?
You probably accidentally hid your favorites section.
Show or hide all the items in a section of the sidebar: Position the pointer over the section heading until the Hide button
or the Show button
appears, then click the button. For example, to temporarily hide your Favorites, position the pointer over the Favorites heading in the sidebar, then click the Hide button
.
Here's more info on how to customize your Sidebar and Toolbar in Finder.