Show in-stock items on top of product list

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

Steps to manage

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