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\!h filter code wrapper filter id wrapper in view.phtml

<?php if ($filter->getItemsCount()): ?>
    <div class="<?php echo $filter->getRequestVar(); ?>-filter-holder">
        <div role="heading" aria-level="3" class="filter-options-title"><?= $block->escapeHtml(__($filter->getName())) ?></div>
        <div class="filter-options-content"><?= /* @escapeNotVerified */ $block->getChildBlock('renderer')->render($filter) ?></div>
    </div>
<?php endif; ?>

\!h collapse filters openclose filters

https://www.magevision.com/blog/post/open-category-filters-by-default-magento-2/
https://magecomp.com/blog/expand-default-layered-navigation-category-filters-magento-2/