You can view what credentials are configured in Sandfly by clicking on the Credentials menu under Hosts.
Credentials are all encrypted and you cannot view the raw details. However, you can see all the credentials in the system and delete or update them as required.
Introduced in Sandfly 4.2, the quantity of hosts that are using a credential is shown in the Hosts column. This is helpful for credential administration along with knowing how many hosts would be affected should it be updated or deleted.