nerdywp

This plugin will let you hide out of stock products in WooCommerce but only for certain categories. WooCommerce currently lets you either hide all out of stock products or none. This expands on that and lets you choose a category to hide when out of stock.
You might want to use this to keep newer products on your website eventhough they’re out of stock. Hiding the older, out of stock WooCommerce products would remove some clutter.

Hide Out Of Stock By Category

An easy and simple way to hide products in WooCommerce by category when they're out of stock

Alcmidia

This plugin helps the user to find the available products more easily.
List the products that are not in stock at the end, in this way the user first sees the products in stock, and the products that are not in stock do not lose their ranking in the search engines index.

WooCommerce Out Of Stock Last

Organizes woocommerce products by listing products out of stock at the end.

Hide Out Of Stock By Category vs WooCommerce Out Of Stock Last