How to access a specific menu item?

Question

1C-Bitrix

Good day. I have a question that I can’t find an answer to in the search, or the solution method is the one that I already know, but I can’t use it. The problem is that you can not use the extended mode. How to access a specific menu item and apply an authorization check to it, if the user is not authorized then styles are applied?

<?if ($arItem["DEPTH_LEVEL"] == 1):?>
        <li><a href="" class="<?if ($arItem["SELECTED"]):?>root-item-selected<?else:?>root-item<?endif?>"
         <?if (!$USER->isAuthorized()):?>style="color: #00ff43;" <?endif?> 
        title="<?=GetMessage("MENU_ITEM_ACCESS_DENIED")?>"><?=$arItem["TEXT"]?></a></li>
      <?else:?>
        <li><a href="" class="denied" title="<?=GetMessage("MENU_ITEM_ACCESS_DENIED")?>"><?=$arItem["TEXT"]?></a></li>
      <?endif?>

I tried everything, but not what is needed is happening, or the parents are affected or without descendants, but one is needed