Hello,

Please add this code to the Theme Settings > Custom JS > On the document ready:

jQuery('.icon-sub-menu').on('click', function(){
	var $siblings = jQuery(this).parent().siblings();
	$siblings.removeClass('opener-page');
	$siblings.find('> ul').slideUp(200);
	$siblings.find('.icon-sub-menu').removeClass('up-icon');
});

Best Regars