Forums will be making significant UX changes to address key usability improvements surrounding search, discoverability and navigation.
To learn more about these changes please visit the announcement which can be found
The settings which you are talking about would be part of miguser.xml
There is not a whole lot of documentation on every setting in the xml file. Basically, if you open the XML using a XML Reader (easy to read), you will have to spend time to find the settings you want to migrate and change the migration to "YES" for that
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