Most Mac apps have buttons at the top of each window in a toolbar. If you don't like the arrangement of buttons in the toolbar, or what to remove or add functionality to the toolbar, you can do so by customizing it. Most native Mac apps, like Safari, Mail, the Finder and also Apple apps like Pages, Numbers and Keynote allow you to customize the toolbar. Some third-party apps also have customizable toolbars, while others use their own system.
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