Gercia....
Try this... right click on a space in the address bar area and untick "Show tabs on a separate row". Is the AOS icon now there beside the Home icon? If yes, right click again and tick the "Show tabs" box and the address bar will shrink and the icon be visible. Problem with this is that the procedure needs be done each time you start IE11. However, the icon actually may be there without doing this, just hidden partially under the address bar. If the above showed the icon, next time you run IE11, don't do the procedure. Mouse over the area immediately next to the address bar. It may just turn green, indicating that the icon is there but hidden. If so, simply click on that oh so small area beside the address bar will open the AOS screen.
Gregg