una/modules/boonex/lucid/data/template/system/menu_main_submenu.html

<div class="bx-menu-main-submenu-wrp">
    <div class="bx-menu-main-submenu-group">
        <ul id="bx-menu-main-submenu" class="bx-menu-main-submenu bx-menu-object-__object__ bx-clearfix">
            <bx_repeat:menu_items>
                <li class="bx-def-padding-sec-right bx-def-padding-sec-left __class_add__">
                    <a href="__link__" onclick="__onclick__"__attrs__>
                        <bx_if:icon><i class="sys-icon __icon__"></i></bx_if:icon>
                        <bx_if:image><img src="__icon_url__" /></bx_if:image>
                        <bx_if:icon-html>__icon__</bx_if:icon-html>
                        <bx_if:title><span class="bx-menu-item-title">__title__</span></bx_if:title>
                        <bx_if:addon>
                            <span class="bx-menu-addon">
                                <span class="bx-menu-addon-cnt bx-def-label menu py-0.5">__addon__</span>
                            </span>
                        </bx_if:addon>
                    </a>
                    <div class="bx-mms-item-hr"></div>
                </li>
            </bx_repeat:menu_items>
        </ul>
        <div class="bx-menu-main-submenu-hr"></div>
    </div>
</div>