There is no additional configuration needed once you have installed Login as Customer. However there are some key features you should be aware of that could come in handy.
- On the Admin sidebar , go to STORES > Configuration > Login as Customer
Restrict User Access
As a best practice you should restrict who have access to Login as customer due to many security reasons. In order to restrict user by role you must first Create a Magento 2 User Role and give it necessary resources
How to login as customer
Navigate to customers page
Navigate to Orders page