Outlook includes several toolbars that contain dozens of toolbar buttons. Most users, however, use only a handful of toolbar buttons during any given Outlook session. Outlook enables you to add or remove toolbar buttons, and even add or remove an entire toolbar.
To quickly toggle toolbars on and off, right-click the toolbar and choose the toolbar’s name from the submenu.
To quickly add or remove a button from a toolbar, click the Toolbar Options arrow at the far-right end of the toolbar. Select Add Or Remove Buttons, and then select the name of the toolbar (such as Standard) you want to edit. You can then add or remove buttons from the list that appears.