Hello Zendesk Community!
I'm excited to share a solution I've developed for a long-standing issue many of us have faced: making dropdown fields searchable in the Zendesk Help Center.
This lightweight, efficient utility provides a seamless searching experience for dropdowns and offers additional customization options and better UI.
Request Thread here:

Here's how you can add this to your help center
1. Add the CDN to your Help Center Open your document_head.hbs file and add the following line.
<script src="https://cdn.jsdelivr.net/npm/zenselect@0.1.5/dist/zenselect.min.js"></script>
2. Add the script to your new_request_page.hbs file:
<script>
document.addEventListener('DOMContentLoaded', function() {
zenSelect('4520048004116',{"placeholder":"Select or Type","emptyMessage":"No Results"});
zenSelect('field_id');
zenSelect('4514796809492',{"placeholder":"Choose who you are"});
});
</script>
-
Replace
'4520048004116','field_id', and'4520371651476'with your actual dropdown field IDs.

That's it! Your dropdown fields should now be searchable. ✌️
(In fact, Utility takes care of all complex manipulations)
Additional Customization:
This solution also allows for easy customization:
1. Custom Placeholder for dropdown
zenSelect('4520048004116', {"placeholder":"Select or Type"});2. Custom No Results Message:
zenSelect('4520048004116', {"emptyMessage":"No Results"});You can combine both options as shown in the initial script.
This solution replaces the old-style dropdown with a more user-friendly, searchable version. It's lightweight, efficient, and easy to add to your help center.
I hope this helps solve a problem many of us have been facing for years. If you find this useful, please consider supporting my work by buying me a coffee ☕ | https://www.buymeacoffee.com/phoenixer
Feel free to ask any questions or share your feedback in the comments below!
Note: Zendesk has already planned to implement this feature, though the rollout date is uncertain. In the meantime, delight your end-users with a seamless selection experience.
Nested dropdowns are not supported at this moment. However, based on feedback and demand, this feature will be included in a future version.

Thanks for sharing the step by step actions for reproduction of the behavior you reported and we're really sorry to know that the workaround solution provided here is no longer working as it used to. So since the said workaround solution isn't an official Zendesk provided, I'm afraid it wasn't guaranteed that it would work 100%.
Additionally, just reiterating that Zendesk has already planned to implement this feature, though the rollout date is uncertain. Moreover, I saw this comment from one of our Product Managers in this Community Post, wherein our Developers plan to roll out templating APi v4 and the accompanying update to the Copenhagen theme, which is part of the roadmap development towards providing dropdown search out-of-the-box very soon.
However, due to competing priorities of product improvements & enhancements, I'm afraid we can't provide any timeline yet nor any information more than this for now. Hence we suggest you follow this Community Post and you may also share your insights & use-case as comment so it may be used by our Developers for the said product improvement/enhancement.