Show default toolbar buttons and menu commands
On the View menu, point to Toolbars, and then click Customize.
Click the Options tab.
Click Reset my usage data.
Notes
The Reset my usage data button affects the buttons shown on a built-in toolbar only if it is not wide enough to display all the buttons. It affects the menu commands shown on the short version of built-in menus only if you have the Always show full menus box cleared on the Options tab in the Customize dialog box.
The Reset my usage data button affects only the toolbar buttons and menu commands of the Microsoft Office program in which the button is clicked.
The Reset my usage data button does not change the location of toolbars, does not remove any buttons or commands you've added by using the Customize dialog box, and does not add buttons or commands you've deleted