The first column format is defined by the WorksheetTableStyle applied to the WorksheetTable. It is stored in the WorksheetTableStyle.AreaFormats collection and keyed by the WorksheetTableStyleArea.FirstColumn value. If there is no area format applied for the FirstColumn value, this property has no effect on the display of the table.
If there is only one column in the table and both the first and last column formatting should be applied, the last column format will take precedence.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2