Let the parent menu item link to a page - wp bootstrap navwalker

At line #120 or if ( $args->has_children && $depth === 0 ) condition change as following

$atts['href']        = $item->url;
//$atts['data-toggle'] = 'dropdown';
$atts['class']       = 'nav-link dropdown-toggle';

Set $atts['href'] to $item->url and remove $atts['data-toggle'] = 'dropdown';