I'm working on Word 2019 on an English SO and Office; I'd like to change the default check spelling language, but no matter what I do when I open a new document it defaults to English.
In Options > Language I changed the preferred language, and I even deleted altogether English, yet for each new document it still defaults to English. If I try to change it from the Language dialogue in an empty document nothing happens; if I write something then delete all the text, it automatically falls back to English.
I also did "Set as default" on a different language, I tried to do that directly on Normal.dotm, nothing changed, the default is always English.
Is it possible to have the system language and the default proofing language different by default?