I'm trying to show on the menus as assigned in WP Menu backend however how is possible to load child of parent page without hiding the rest.
Example
Main-1
Main-2
Main-3
When Clicking on Main-1 should show
Main-1
---Sub-1
---Sub-2
Main-2
Main-3
<?php if (has_nav_menu( 'secondary' )) {
wp_nav_menu( array(
'container' => '',
'container_class' => '',
'menu_class' => '',
'menu_id' => 'menu-header-menu',
'fallback_cb' => 'wp_page_menu',
'items_wrap' => '<ul id="%1$s">%3$s</ul>',
'sort_column' => 'menu_order',
'theme_location' => 'secondary' ) );
}
This is the main code I'm using