If you execute the following query:
SELECT slo_name FROM sys.dm_user_db_resource_governance
You will get:
On the results, the prefix "SQLDB_GP_S_GEN5" means Azure SQL Database General Purpose (GP) Serverless (S), Gen 5. See other columns of the sys.dm_user_db_resource_governance for more details about the database.
If I use your query on the context of your serverless database like:
SELECT d.name,
slo.*
FROM sys.databases d
JOIN sys.database_service_objectives slo
ON d.database_id = slo.database_id;
You get almost the same:
That "S" on the service objective column "GP_S_Gen5_1" means Serverless.
Please upgrade the SQL Server Management Studio to the latest version for a better Azure user experience.