The various Impress toolbars can be displayed or hidden by clicking View > Toolbars and selecting from the menu. You can also select the icons that you wish to appear on each toolbar. For more information, refer to Chapter 1 (Introducing OpenOffice.org).
Many of the toolbars in Impress are similar to the toolbars in OOo Draw. Refer to the Draw Guide for details on the functions available and how to use them.