To freeze a row or column, open the ‘Design‘ view of your report. You can right-click the tablix and choose ‘Tablix Properties‘. Set these options:
- ‘Repeat header rows on each page‘: This will display the header on every page.
- ‘Keep header visible while scrolling‘
- ‘Repeat header columns on each page‘: This will display the header on every page.
- ‘Keep header visible while scrolling‘
This tells you what changed:
https://docs.microsoft.com/en-us/sql/relational-databases/track-changes/work-with-change-tracking-sql-server?view=sql-server-ver15