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Gets or sets whether column widths are adjusted to fit the longest text width for printing.
When this property is true, the worksheet uses best-fit column widths during printing.
bool BestFitColumns { get; set; }
Property BestFitColumns As Boolean
IPageSetup pageSetup = worksheet.PageSetup;
pageSetup.BestFitColumns = true;
bool bestFitColumns = pageSetup.BestFitColumns;