Show in-stock items on top of product list

This app allows to let in-stock products appear on top of the collection page, and the out-of-stock items at last.

Steps to manage

1. From the left app’s navigation bar, click on the Settings under the Filter topic.
2. In the General tab, scroll down to the Sort By section.
3. In the Default sort by dropdown, choose the Availability, in-stock first option.
4. Click Save to finish.