marcrandall

Turn your standard woocommerce product categories widget into a smooth collapsible accordion. 
This plugin should work out the box with most themes.
<ul>
<li>Supports unlimited subcategories</li>
<li>Current category will be expanded on page load</li>
<li>Lightweight and requires little configuration</li>
<li>You can customise the look in your themes CSS editor</li>
</ul>

Woocommerce Sidebar Category Accordion

the plugin is light, compatible with two themes (I've tested) and it does what it says.

works like a charm

Turn your standard woocommerce product categories widget into a smooth collapsible accordion.

Themepoints

WooCommerce Category Accordion plugin enables you to list WooCommerce product categories and subcategories in an accordion format with expand/collapse functionality.
<ul>
<li><a href="https://themepoints.com/woo-accordion" rel="nofollow ugc">Live demo!»</a></li>
</ul>
Plugin Features 
<ul>
<li>Accordion presentation of WooCommerce category items.</li>
<li>Toggle functionality for expanding and collapsing accordion sections.</li>
<li>WordPress Widget compatibility.</li>
<li>Option to hide empty categories within the accordion.</li>
<li>Sorting capabilities by ID, Name, and Slug.</li>
<li>Full compatibility with WooCommerce.</li>
<li>Support for multiple accordions.</li>
<li>Cross-browser compatibility.</li>
<li>Simple installation and setup process.</li>
<li>Automatic lifetime updates enabled.</li>
<li>And many more.</li>
</ul>

Category Accordion for WooCommerce

WooCommerce Category Accordion plugin enables you to list WooCommerce product categories and subcategories in an accordion format with expand/collapse …

Woocommerce Sidebar Category Accordion vs Category Accordion for WooCommerce