Andy Brownsword just wnats things to line up correctly:
If you’ve tried to get header rows to repeat or scroll as you move through your paginated reports, you may have felt the frustration of getting them working correctly. Whether it’s Reporting Services, Power BI, or Fabric, the flavour doesn’t matter.
The properties on the tablix should provide the functionality, but they’re not reliable. In this post we’ll look at how to achieve the repetition and scrolling behaviour that will work consistently.
Read on to re-experience one of the more annoying pain points around SQL Server Reporting Services and now Power BI paginated reports.