ExcelFile.HeadingRowHeight Property
Height that will be used by the added row with column headers when PrintHeadings is true. The default value (0) means to use an automatic value which is fine with normal fonts. A positive value will make the column wider or narrower.A negative value will auto-calculate the height depending in the normal font of the spreadsheet.
Syntax
Namespace: FlexCel.Core
public abstract Double HeadingRowHeight { get; set; }