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Gets or sets whether the worksheet is scaled as a percentage.
If this property is true, the worksheet uses percentage-based scaling.
If this property is false, the FitToPagesWide and
FitToPagesTall settings control how the worksheet is scaled.
bool IsPercentScale { get; set; }
Property IsPercentScale As Boolean
IPageSetup pageSetup = worksheet.PageSetup;
pageSetup.IsPercentScale = true;
bool isPercentScale = pageSetup.IsPercentScale;