Simply add the following code to your child theme functions.php file or via the popular Code Snippets plugin to completely disable the WPBakery Page Builder front-end editor. Note: If you are adding the code via a plugin like Code Snippets you may need to hook into the "init" hook to ensure the WPBakery Page Builder plugin has loaded before this code runs.
if ( function_exists( 'vc_disable_frontend' ) ) {
vc_disable_frontend();
}