Visual Composer's Grid Elements are by default disabled. Each one of our themes provide their own handcrafted grid elements.
If in any case you need to re-enable the default Grid Elements of Visual composer, you need to add a filter hook in your Child Theme.
Just add the following snippet in the functions.php file of your Child Theme.
function grve_child_vc_grid_visibility() { return true; } add_filter( 'grve_vc_grid_visibility', 'grve_child_vc_grid_visibility' );
All Grid Elements will then be visible and configurable.