Step #1 Set rules.
Go to the “Settings” page.
Choose a sort type Your enabled collections are sorted according to this sorting type.
Choose sync frequency On your enabled collections, out of stock products are pushed down at this scheduled time. If you choose the hourly option and set a run on time, collections are sorted based on the minute part of the time. For example, if you set to 12:15, sorted at every hour at minute 15.
If you want to hide out of stock products after x days are being out of stock;
Check the Hide option.
Enter the day number to specify when the out of stock products are hidden. If you set to 0 this place, products are hidden as soon as they are being out of stock.
If you want to publish the products when they are in stock, check Unhide option.
Step #2 Enable collections.
Go to the “See Collections” page.
Enable all collections with turn-on their status.
Out-of-stock products in these collections are pushed down and products re-ordered according to the sorting rule. You can check a collection to ensure how it’s working.