Hey There,
Thanks for writing in!
Yes, you can do so by using Visual Composer or Uber Menu as well. Each column represent a sidebar, so if you wish to change it then you will have to do a full customization of footer area. Or simply use a blank – no footer template then create your own columns using visual composer and choose widget placement element for each column.
Let us know if you need any further information on this!
Thanks for understanding!