I'm not sure why, but my units in Illustrator keep defaulting to "Points", when I've never once used points for any form of measurement except type size. I've changed the preferences both in document and restarting Illustrator without opening a file but it keeps setting them to Points. I just want my document print sizes to stay in mm.
Usually, the document units from the document you open will set the units and override the preferences setting.
If you create a new document with mm as units or open an old document that certainly has mm units and the units still change, you may try to restart and reset your Preferences:
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