aa-globe

This plugin has no settings. 
Just activate the plugin and check if sold out items have moved to the bottom of the list.

Catalog Sorting by Stock Status – In Stock First, Sold Out Last

This plugin changes the sorting of a catalog (or product category) so that out-of-stock items are always at the end of the list

SilbinaryWolf

Ultimate Metabox Tabs adds metabox tabs to your posts, pages and the Advanced Custom Fields options page. 
They allow you to easily allow tabbable and sortable metaboxes on your editing page so that your client can do less scrolling and more editing. 
They’re also inserted at server-time, meaning no ugly javascript forcing the metaboxes into the page.

Ultimate Metabox Tabs

Ultimate Metabox Tabs allows for keeping your post/page and ACF options user friendly for your client with the use of tabs.

Catalog Sorting by Stock Status – In Stock First, Sold Out Last vs Ultimate Metabox Tabs