What's the difference between Azure DB user and Data Studio user?

In Azure Data Studio - Connection, i see: 

Authentication type: SQL Login, Username: smssecret

In Azure - SMS-My-DB (changesfsms/SMS-My-DB) | Properties, i see: 

Server admin login: CloudSA1fb2secret

• Why don't i see CloudSA1fb2secret in Azure Data Studio? 
• Why don't i see smssecret in Azure - SMS-My-DB (changesfsms/SMS-My-DB) | Properties?