Explanation:
Box 1: Export the data
For databases that don't qualify for reverse migration [See Limitations for reverse migration below], the only way to migrate from Hyperscale to a non-Hyperscale service tier is to export/import using a bacpac file or other data movement technologies (Bulk Copy, Azure Data Factory, Azure Databricks, SSIS, etc.) Box 2: Set the Service tier to General Purpose.
Reverse migrate a database from Hyperscale
You can migrate an existing Hyperscale database in Azure SQL Database to the General Purpose service tier using the Azure portal, the Azure CLI, PowerShell, or Transact-SQL.
Reverse migration to the General Purpose service tier allows customers who have recently converted an existing database in Azure SQL Database to Hyperscale to move back in an emergency, should Hyperscale not meet their needs. While reverse migration is initiated by a service tier change, it's essentially a size-of-data move between different architectures.
Reference:
https://learn.microsoft.com/en-us/azure/azure-sql/database/reverse-migrate-from-hyperscale