> For the complete documentation index, see [llms.txt](https://docs.bacachi.net/mate-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bacachi.net/mate-documentation/collections-page/filter-sidebar.md).
# Filter Sidebar
To use the "Filter Sidebar," you must install a Shopify app called [**"Search & Discovery"**](https://apps.shopify.com/search-and-discovery).
After installing the app, please click on "**Apps**" and select the "**Search & Discovery**" application to customize the filter as you like.
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**Please note**: All Shopify apps come with detailed documentation. To see detailed instructions for using this application, please read [**HERE**](https://help.shopify.com/en/manual/online-store/search-and-discovery/filters)
{% endhint %}