1. Click the menu Contacts
2. Select a contact
3. Click the tab Mutations (scroll to the far right of the row of tabs)
All mutations are listed with date, e-mail of the acting user and name of the mutated field.
4. Select a Mutation from the list
The upcoming screen shows the old and new values of the mutated field except in case it concerns a new record, then both fields are empty.
5. Click the button Close