Note When you delete a built-in button, the button is still available in the Customize dialog box. However, when you delete a custom button, it is permanently deleted. To remove and save a custom button for later use, create a toolbar for storing unused buttons, move the button to this storage toolbar, and then hide the storage toolbar.
Tip To quickly delete a built-in button from a built-in toolbar, click More Buttons on a docked toolbar, or click the arrow in the upper-left corner of a floating toolbar; click Add or Remove Buttons, and then clear the check box next to the button you want to delete.