I am not one of those who criticize the ribbon in Microsoft and other software. On the other hand, while the large monitor of my desktop PC offers a plenty of working space, I cannot say the same about my laptop screen. When working on the laptop, the ribbon may take too much of valuable space. Here is what to do to toggle the ribbon on and off in SDL Trados Studio 2014.
This is the initial condition when the ribbon is on:
Press CTRL+F1 and voilà, the ribbon is hidden.