When metadata ownership needs to be transferred from one user to another for all or specific metadata records, the Transfer Ownership option is available.
It is located in the “actions on selected set” in the search result and once selected, opens the following panel.
Select New Owner: Select a user in this auto-complete.
The drop down will be filled with all Editors visible to you. If you are not an Administrator, you will view only a subset of all Editors.
Select group: Select one of the groups this user is a member of. Privileges to groups All and Intranet are not transferable.