If the Owner wants to change the email address of their respective sub-users, they can change it.
Step 1:
Owners can change the email address of any of their sub-users(Dashboard, Manager, Supervisor and Agent)
Login to the Dashboard -> Users & Performance -> Users setting
Now you can click on the edit button.
Step 2: Now you have to save it.
Step 3: Now you have to check the new email address and verify it.