How to modify cbx bookmark grid cols https://codeboxr.com/product/cbx-wordpress-bookmark/

gistfile1.txt

add_filter('cbxwpbookmark_bookmarkgrid_cols_class', 'cbxwpbookmark_bookmarkgrid_cols_class_extend', 10, 2);

/**
 * Change grid size
 *
 * @param $grid
 * @param $object_type
 *
 * @return mixed
 */
function cbxwpbookmark_bookmarkgrid_cols_class_extend($grid, $object_type){
    //grid default value 'col-xs-12 col-sm-6 col-md-4'
    //we used bootstrap grid

    //$grid = 'col-xs-12 col-sm-6 col-md-4'; //change and uncomment this line to change grid values
    $grid = 'col-12'; //change and uncomment this line to change grid values


    return $grid;
}