The Tool Bars are a set of icons along the top of the screen and most icons are associated with a command on the main menu (the icon will appear to the left of the menu option when browsing the main menu). Some icons have a small down arrow in the lower-right corner that indicates the icon will drop down a list of items when clicked. Placing the mouse over an icon for a second will display a hint containing the name of the icon and the keyboard shortcut.
Five different icons in the tool bar may be highlighted (pressed in) depending upon the current file. The Toggle Hex Interface icon will be highlighted when the current file uses a hex-based File Interface, the Word Wrap icon will be highlighted when the current text file is in Word Wrap mode, the Show Whitespace icon will be highlighted when whitespace is visible in the file, the Column Mode icon will be highlighted when the current file is in column mode, and the Toggle Endian icon will be highlighted when the current file is in big-endian mode (see Byte Ordering for more information).
Right-click on the Tool Bar background to display a popup menu with a list of all Tool Bars. Click on a Tool Bar name in the list to either show or hide that Tool Bar and this list can also be accessed from the View Menu. Tool Bars can be customized by selecting Customize... from the right-click menu or clicking 'Tools > Options...' and selecting Toolbars from the list (see Toolbar Options for more information).