I can also see typeclasses listed in columns on dataset previews. There a few examples of datasets on our instance where a column that is a primary key for an object has typeclass ontology.<object_name> and that column then becomes hyperlinks that would open the relevant object.
Interestingly the <object_name> above is not the same as the objectTypeID, but it generates a url in the form:
https://<instance>/workspace/hubble/external/object/v0/<objectTypeId>?<primary_key_property_name>=<primary_key_value>
This appears possible on datasets that back objects, and ones that don’t back objects.
I don’t know anyone who has ever been able to discover where this is set - as I think it was originally set up on datasets created by Palantir people.