Since i changed my computer, the AI does not find ANY good group for classify, it just proposes totally bad matches. how can i rest it please?
No, you can’t reset the AI.
Please provide more information when reporting issue or making inquiries. You haven’t defined what a good or bad match is and there are no screen captures to assess.
Example. i have a group “starlink” in one of my open databases. DT finds all documents containing “Starlink” (including those already manually classified in this group) . But when AI proposes groups, there is not the most obvious group “Starlink” in the choice.
oh sorry, i saw that “Current database only” was ticked. I did never tick this field ??!
Yes, that option will definitely change the suggested groups and documents. 
is it possible that this option has been automatically toggled on after an update?
It’s technically possible but I don’t have any other data to support that.
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DEVONthink just remembers the last used setting, by default it’s off.