Hey, I had the same problem finding the additional hotbars, it's quite easy if you follow the above steps. The fastest way is to hit ESC>HUD layout>then right click on the name of the ui element (hotbars in our case) you wish to enable/disable. If the name is blueish it's disabled, while white means it's enabled. :3

Also, hotbars 1 to 3 change with each job change while the rest are static.