Thanks for your reply. It was indeed a theme, not a plugin.
You can mark this as resolved.
I have the same question. How do I use the plugin? I activated it but I dont know what to do afterwards.
(Edit )
Nevermind. I realized its a plugin that helps you embed your own JS code. I found the css selector for the nth category and clicked it by modifying the code a tiny bit:
$(‘.sh-filter .sh-filter-item:nth-child(2)’).trigger(‘click’);
Thanks much for the plugin and code.