Freezes panes in a worksheet or returns the cell at which the panes are split. Set the property to a Cell object. The cell specified in
Worksheet.FreezePanes is the first unfrozen cell; freeze panes will be applied to all rows above the cell and all columns to the left of the cell.
Freeze panes can only be applied to the first few rows or first few columns of a worksheet. This is a limitation of Excel and not ExcelWriter.