Hi
The affected user is still loading the Supervisor layout in Finesse , "Manage team" tab is a part of Supervisor layout . Thus if the Supervisor is not managing a team no data will be visible .You can click on profile dropdown top right and check if it says Supervisor or Agent.
A agent layout has different tabs

If you want to convert them completely to agent ,you can try :
+Remove supervisor role from CCX Administration ->Tools ->User Management -> User View
+Verify the user is removed from Supervisor group from CUIC via CUIC -> Configure -> Groups ->Supervisors
+Relogin to finesse desktop page