Hi Erich,
FirstVisibleColumn and LeftVisibleColumn are used to Select / Highlight a cell in the worksheet. You may check our class reference in the link below which could give you more details.
IWorksheet MembersAs you said, the column can be show / hide using the
ShowColumn
method. If you do not want the data in the sheet and like to delete them permanently, you may make use of
sheet.DeleteColumn()
method.
Please try this and let me know if you have any questions.
Regards,
Geetha