vCore purchasing model - Azure SQL Database
Select hardware configuration
You can select hardware configuration for a database or elastic pool in SQL Database at the time of creation. You can also change hardware configuration of an existing database or elastic pool.
To select a hardware configuration when creating a SQL Database or pool Step 1: Start Azure portal Step 2: Go the Azure SQL page, select db1.
Step 3: On the Overview page, select the Pricing tier link:

Step 4: Select the Change configuration link:

Step 5: Select the desired hardware configuration:
Specify:
Max vCores: 4
Max storage: 45 GB

Reference:
https://learn.microsoft.com/en-us/azure/azure-sql/database/service-tiers-sql-database-vcore