Thanks for the suggestion, I will flag this post for the developer to look at.
I think I know what you’re looking for, to add custom taxonomies to the “Hide on screen” section? Currently that’s just a generic list, you’ll notice that all the same options appear no matter where the group is being attached to or if that edit screen even has those options. I don’t know if the developer will want to expand this to non-standard WP things.
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