Assume that you have a report that contains Simple Data Grid in Microsoft SQL Server 2016 Reporting Services (SSRS 2016), SQL Server Mobile Publisher or Power BI Report Server. When you expand the Data Grid and then click any item within the grid, you may notice that the row header disappears.
This issue is fixed in the following cumulative update for SQL Server:
About cumulative updates for SQL Server:
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server: