IN the Sales Tab/ ...."add and manage customers"....one cannot see the list of actual customers so there is no edit possible here. This window only allows to add new customers. So there is no management feature of existing customers.
To be able to update a customer data one shall enter the sales procedure and edit there ..which is kind of wierd.
I also notice for the items and custoemrs to have not large enough ( long) drop down list windows. Why?