Ship Out of Stock products like Magento 1 (backorders)?

[Espamoto]

Hello, do you know how to ship out of stock products (backorders) like Magento 1?

I see error: Not all of your products are available in the requested quantity.

Thanks

[Espamoto]

nobody knows? I can't have the orders in Processing.

[Espamoto]

My configuration:

https://imgur.com/lfXdQob

https://imgur.com/vRVVkWB