Wordpress

navwalker.php

                        if ( $args->has_children && $depth === 0 ) {
                                //  $atts['href']                   = '#'; 
							    $atts['href'] = ! empty( $item->url ) ? $item->url : ''; //use link instead of pragma link
                                $atts['data-toggle']        = 'dropdown';
                                $atts['class']              = 'dropdown-toggle disabled'; // add disabled to this part so e.preventdefault will be override
                        } else {
                                $atts['href'] = ! empty( $item->url ) ? $item->url : '';
                        }

                        $atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args );

                        $attributes = '';
                        foreach ( $atts as $attr => $value ) {
                                if ( ! empty( $value ) ) {
                                        $value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
                                        $attributes .= ' ' . $attr . '="' . $value . '"';
                                }
                        }

navwalker.php -> here you make the nav main link work with URL linking.