Hi there!
As we can’t predetermine to which category the post is going to belong, the extension registers a preset default to be used in the post meta settings’ drop-down, after which it locks and applies the selected option.
Nevertheless, it is possible to hijack this information as it’s sent to the server, right before it’s saved. We could determine the assigned category, and then override the POST-action meta value; however, the usability and accessibility of the settings will be severely penalized: Your input won’t be honored.
As I’m not 100% familiar with the new Block Editor, recently brought with WordPress 5.0, I can’t give a concrete solution that’ll last and work with both the Classic Editor and the new one.
Programming helps in making your life easier and less error-prone, but I don’t think this should be applied in all imaginable scenarios, just “because we can.”
So, if most of your posts are of the NewsArticle type, then I suggest setting that as a default, which I’ve documented as an example in the developer section of the extension’s overview page.
