This other topic How to get a list of unpublished documents? asks how to query for unpublished documents on the API.
I have a similar question but all I want to do is see all documents with draft versions in the writing room. It's quite easy for in-progress edits to get lost amid changes which were published. When there are hundreds of documents this situation gets more and more common.
Don't just point me to the "releases" feature, please. I know about that already, and though yes it can be used to group unpublished content, that doesn't help with things which were edited in a more ad-hoc way and which were left unfinished through distraction or priority shifts or waiting on a third party.
Please add a filtering option for document status. I really expected "planned" to have not just releases but also unpublished drafts. I could have sworn this feature used to exist, in fact, but I could be mistaken.