Make parent link clickable in Bootstrap for Desktop with WordPress NavWalker

class-wp-bootstrap-navwalker.php

if (wp_is_mobile()){
  $atts['href']          = '#';
  $atts['data-toggle']   = 'dropdown';
  $atts['aria-haspopup'] = 'true';
  $atts['aria-expanded'] = 'false';
  $atts['class']         = 'dropdown-toggle nav-link';
  $atts['id']            = 'menu-item-dropdown-' . $item->ID;
} else {
  $atts['href']          = ! empty( $item->url ) ? $item->url : '';
  $atts['aria-haspopup'] = 'true';
  $atts['aria-expanded'] = 'false';
  $atts['class']         = 'dropdown-toggle nav-link';
  $atts['id']            = 'menu-item-dropdown-' . $item->ID;
}

style.css

/*
*Add this CSS in your (style.css) file.
*/
.dropdown:hover>.dropdown-menu {
  display: block;
}