Open a document, choose View > Customize Toolbar (from the View menu at the top of your screen, not from the View button in the toolbar).
Do any of the following:
Add or remove items from the toolbar: Drag an item to the toolbar to add it. Drag an item away from the toolbar to remove it.
Rearrange items in the toolbar: Drag an item to reorder it. The Format and Document buttons move together and can’t be separated.
Reset the toolbar: To restore the toolbar to the default setting, drag the set of buttons at the bottom of the window to the toolbar.
Remove button names: Choose Icon Only from the pop-up menu at the bottom of the window. By default, buttons are shown with their names.
Click Done.