The toolbar, in a Finder window, provides easy access to commonly used window commands. You can use the Toolbar Control button three different ways: to hide the toolbar, to display more information in the window, or to show the toolbar to display tools and navigational controls. When you hide the toolbar, the Finder also hides the Sidebar panel and window borders, and moves the status bar to display under the title bar.
Toolbars in the Finder consist of the following parts: