Hi Milton,
Sorry to hear that the new Office for Mac version didn't resolved your issue.
But I believe the version 16.33 could be the remedy for other users who might have the same issue.
In this kind of scenario, could you try creating a new user profile on your Mac and login this new user profile and check if the "AutoSave been disabled" issue persist?
Set
up users, guests and groups on Mac
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Please give it a try and let us know the result.
Regards,
Alex Chen