winter/modules/system/partials/_settings_menu_items.php

<?php
$context = System\Classes\SettingsManager::instance()->getContext();

$collapsedGroups = explode(
    '|',
    isset($_COOKIE['sidenav_treegroupStatus']) ? $_COOKIE['sidenav_treegroupStatus'] : null
);
?>

<ul class="top-level">
    <?php foreach ($items as $category => $items):
        $collapsed = in_array($category, $collapsedGroups);
        ?>

        <li data-group-code="<?= e($category) ?>" <?= $collapsed ? 'data-status="collapsed"' : null ?>>
            <div class="group">
                <h3><?= e(trans($category)) ?></h3>
            </div>

            <ul <?= $collapsed ? 'style="overflow: visible; height: 0px; display: none;"' : null ?>>
                <?php foreach ($items as $item): ?>
                    <li class="<?= strtolower($item->owner) == $context->owner && strtolower($item->code) == $context->itemCode ? 'active' : false ?>" data-keywords="<?= e(trans($item->keywords)) ?>">
                        <a href="<?= $item->url ?>" ontouchstart="">
                            <i class="<?= $item->icon ?>"></i>
                            <span class="header"><?= e(trans($item->label)) ?></span>
                            <span class="description"><?= e(trans($item->description)) ?></span>
                        </a>
                    </li>
                <?php endforeach ?>
            </ul>
        </li>
    <?php endforeach ?>
</ul>