Accelerated database recovery (ADR) improves database availability, especially in the presence of long running transactions, by redesigning the database engine recovery process. ADR is new in SQL Server 2019. It is enabled by default in SQL Database and SQL Managed Instance and cannot be disabled.
I have ADR enabled on my production database running on SQL Server 2019. In the SQL Server logs , it shows the messages:
[VersionCleaner][DbId:6][sweepOfSelectivePages]: Cleanup of sidelist