I am not sure what to call it but it seems to have started some where in version 9 and always pops up in the right corner of the document. It is persistent and when cancelled always comes back. You can navigate the page with it. I for the life of me can't find a preference to disable it so I don't even know what to call it but if there is no way to disable it then this is definitely a request for a disable button as it bothers me most of the time. Navigating a large page would be useful but not a small page in my opinion. THanks!