If you want to reduce the clutter on you toolbar within Internet Explorer, you can do so by removing those buttons you do not use. For example, if you do not use the Edit button or the History button, you may just want to remove them.
You can do this within Internet Explorer by clicking the View menu, pointing to Toolbars, and clicking the customize button. Under the list of Current Toolbar Buttons, highlight those that you do not want displayed on your toolbar and click Remove. Conversely, you can add additional buttons by highlighting a button under the list of Available Toolbar Buttons and click Add.