When you add a section with the Visual Composer, you may get this list of available elements.
As you may guess, it’s not complete.
To enable more Visual Composer modules, go to Settings > Visual Composer > User groups access rules > Administrator (or any other user you want to edit) and put the check marks at the modules you need to use while working on your site.
Save changes and refresh the editing page. Now after you add an element to the page, all the selected modules will appear.
DFD Support Team