Drag and drop for the application panel doesn't work

I am trying to modify the application panel. However, when I try to drag the icon from “applications in the bar” to “applications not in the bar” window nothing is moving. Would appreciate some help.

FYI, my OS is Ubuntu 16.04, and I am using Chrome internet browser.

Works well for me on XWiki 11.5. Try to clean your browser cache maybe.

Thanks for the reply. The problem appeared to be with the access right to the directories.