composer require ghoster/module-outofstockatlast

• Extension on GitHub
• Direct download link

• Sort Out Of Stock Product At last the product list
• Compatibility with smile/elasticsuite~2.10.0
• Firstly Display Out of Stock Products Stores > Configuration > Catalog > Inventory > Stock must be set Yes
• Of course, we are talking about Elastic Search. We don't support old search engine
• From time to time we remind you Reindexing after you enable the module

* = in production please use the --keep-generated option

• Unzip the zip file in app/code/GhoSter
• Enable the module by running php bin/magento module:enable GhoSter_OutOfStockAtLast
• Apply database updates by running php bin/magento setup:upgrade*
• Flush the cache by running php bin/magento cache:flush

• Make the module available in a composer repository for example:
  • private repository repo.magento.com
  • public repository packagist.org
  • public GitHub repository as vcs
• Add the composer repository to the configuration by running composer config repositories.repo.magento.com composer https://repo.magento.com/
• Install the module composer by running composer require ghoster/module-outofstockatlast
• enable the module by running php bin/magento module:enable GhoSter_OutOfStockAtLast
• apply database updates by running php bin/magento setup:upgrade*
• Flush the cache by running php bin/magento cache:flush

• Reindexing after you enable the module

If this project help you reduce time to develop, you can give me a cup of beer :)