In g-Viewer, we have various menus designed to perform various tasks. These are all available in the top part of g-Viewer software as a Ribbon. It can be toggle on/off using the button 
at the top right most corner of the g-Viewer main window as shown below.
For any reason, user wants to toggle OFF the ribbon then they simply need to click on the 
button. Then all the icons like Add, Delete, Read headers etc will be collapsed and hidden.
If the user wants to bring them back, they can click on the 
button to bring it back to it's original position.
What about the significance of the other icon 
(If you hover the cursor, it will display the tool tip as Switch toolbar) on the extreme right of the ribbon. Let's see what will happen if we click on this icon...
The entire design layout can be adjusted to a more standardized appearance. These changes are purely cosmetic, and users can customize the settings to suit their preferences. If users wish to revert to the default layout at any time, they can simply click the icon, which will restore the original display.
As we see, within the ribbon we have few menus. We are going to discuss each one of them briefly in the following sections.