una/template/menu_horizontal.html

<ul class="bx-menu-hor bx-menu-object-__object__ bx-clearfix">
    <bx_repeat:menu_items>
        <li class="bx-def-margin-right-auto __class_add__"><a href="__link__" target="__target__" onclick="__onclick__">__title__</a></li>
    </bx_repeat:menu_items>
</ul>