Can I edit user's “Aliases"?
Best answer by cody
Aliases can’t be selectively edited. Once a user ID has been aliased with another user ID, they are linked together permanently.
That being said, if you delete a user ID from the dashboard, all of their aliases are deleted as well. This will remove all associated transactions and user properties with that user ID and its aliases, and is even appropriate for GDPR requests. The aliases can be re-used, though, and will no longer be linked together if you re-identify with them.
I’d recommend reading through the deleting users doc for more information.