I had the usual 3 hotbars as sub-panels on the UI. You can drag them larger or smaller, so far so good.
I dragged one all the way to the right, and it disappeared. Well, ok, that's interesting. But I cannot figure out how to make it reappear.
I can get access to it by using the tabs at the bottom, e.g. All, Common, (class), Items, etc. But I want to go back to multiple showing at the same time.
There is no intuitive way to do this I can find. In fact, I can find no way to do it at all. Google-fu fails, though one suggests saving, quitting, and restarting the game. This does not work.
There is no little draggy or button anywhere on the UI that I can find, nor can I find it under options.
