winter/modules/system/partials/_system_sidebar.php

<div class="layout-cell sidenav-tree bg-p" data-control="sidenav-tree" data-search-input="#settings-search-input">
    <a class="back-link" href="<?= Backend::url('system/settings') ?>"><i class="icon-angle-left"></i><?= e(trans('system::lang.settings.menu_label')) ?></a>

    <div class="layout">
        <div class="layout-row min-size">
            <?= $this->makePartial('~/modules/system/partials/_settings_menu_toolbar.htm') ?>
        </div>

        <div class="layout-row">
            <div class="layout-cell">
                <div class="layout-relative">

                    <div class="layout-absolute">
                        <div class="control-scrollbar" data-control="scrollbar">
                            <?= $this->makePartial('~/modules/system/partials/_settings_menu.htm') ?>
                        </div>
                    </div>

                </div>
            </div>
        </div>
    </div>
</div>