Display the Sub Menu in Current Page in the Vertical Header Style
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If you wish to display/show the sub-menu in the current page when using the Vertical Header style, use the following CSS snippet:
/* Display all sub menu on the current page */
#site-header.vertical-header #site-navigation-wrap .dropdown-menu > li.current-menu-parent .sub-menu { display: block !important; }
All CSS snippets should be added via a child theme's style.css file or using the built-in Custom CSS panel.