// Create a new workbook Workbook workbook = new Workbook(); workbook.open(this.getResourceStream("xlsx/PageSetup Demo.xlsx")); IWorksheet worksheet = workbook.getWorksheets().get(0); //Set page order, default is DownThenOver. worksheet.getPageSetup().setOrder(Order.OverThenDown); // Save to an excel file workbook.save("ConfigPageOrder.xlsx");