By default Visual Composer is turned on only for pages, that is made for work optimization of the theme. In order to turn on Visual Composer for editing of necessary pages, you’ll need to perform a few simple steps.
Go to Visual Composer Settings – tab Role Manager – open panel Administrator – in drop-down Post types choose Custom and mark necessary sections, save.
After this interface Visual Composer will be available, where you have marked it.
Please see the image below as an example
