una/template/_page_submenu.html

<div id="bx-menu-main-bar-wrapper" class="bx-menu-main-bar-wrapper bg-white dark:bg-gray-900 border-b border-gray-200 dark:border-gray-800 __site_submenu_hidden__">
    <div id="bx-menu-main-bar" class="bx-menu-main-bar __site_submenu_class__ bx-def-page-width mx-auto px-4 sm:px-6 lg:px-8 box-border">
        <div class="bx-menu-main-bar-cnt -mb-px">
            <bx_injection:injection_top_menu_before />
            <div class="flex items-center h-full text-center">
                <div class="relative flex-1 h-full">
                    <div class="absolute w-full h-full">
                        <bx_menu:sys_site_submenu />
                    </div>
                </div>
                <div class="flex-none">
                    <bx_menu:sys_site_manage />
                </div>
            </div>
            <bx_injection:injection_top_menu_after />
        </div>
    </div>
</div>
<bx_injection:injection_between_content_menu />