In Odoo standard, subscriptions are typically set up to automatically close if there are unpaid invoices. The subscriptions get closed based on the number of days filled in the "Automatic Closing" field of the subscription configuration.

Basically Odoo standard does not provide any such option to prevent the auto-closing of a subscription if the invoices are unpaid.

But Ksolves has a Sales Subscription module in which we have given this functionality to prevent the auto-closing of the subscription with unpaid invoices and provide other interesting features as well.

You can go through the below link to learn more about this Sales Subscription module.

Refer Sales Subscription module by Ksolves on Odoo store!

Regards

Ksolves Team!