Hi @misterg68
This official document describes what's new in each version of SSRS: https://learn.microsoft.com/en-us/sql/reporting-services/what-s-new-in-sql-server-reporting-services-ssrs?view=sql-server-ver16.
This document is the release notes for SSRS 2017 and later: https://learn.microsoft.com/en-us/sql/reporting-services/release-notes-reporting-services?view=sql-server-ver16.
Hope these help you.
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Aniya