What is the best way to save node without the required field values?
It would be something like "save as unpublished" and the required validation is omitted, but I am not sure in which module I can find this functionality and how to set it up.
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I finally solved this using the Require on Publish module. It offers an additional checkbox to require only when publishing the node.
This module allows fields to be required only when the piece of content is being published or is already published. This can be used when you have fields such as tags or SEO information on your piece of content that editors really don't need to fill in until the content is going live.