Hi kirtim,

This is the limitation when exporting to Excel. It's not supported to have the column header fixed while scrolling in Excel. Because after exporting to excel, the whole report area is cell based, it just hide the border of each small cells in Excel. That's not a real row in Excel. For more info, please see:

https://msdn.microsoft.com/en-us/library/dd255234.aspx#PageHeadersFooters