How to adjust zoom ratio in Excel to PDF conversion?

// Set zoom value
worksheet.PageSetup.Zoom = 50;

using Syncfusion.XlsIO;
using System.IO;
using System.Reflection;
using Syncfusion.ExcelToPdfConverter;
using Syncfusion.Pdf;
 
namespace Zoom_Ratio
{
    class Program
    {
        static void Main(string[] args)
        {
            using (ExcelEngine excelEngine = new ExcelEngine())
            {
                // Instantiate the excel application object
                IApplication application = excelEngine.Excel;
 
                // The workbook is opened
                IWorkbook workbook;
 
                // Open existing workbook with data entered
                Assembly assembly = typeof(Program).GetTypeInfo().Assembly;
                Stream fileStream = assembly.GetManifestResourceStream("Zoom_Ratio.Sample.xlsx");
 
                workbook = application.Workbooks.Open(fileStream, ExcelOpenType.Automatic);
 
                // The first worksheet object in the worksheets collection is accessed
                IWorksheet worksheet = workbook.Worksheets[0];
 
                // Set zoom value
                worksheet.PageSetup.Zoom = 50;
 
                // Create an ExcelToPDFConverter instance
                ExcelToPdfConverter converter = new ExcelToPdfConverter(worksheet);
 
                // Initialize PDF Document
                PdfDocument pdfDocument = new PdfDocument();
 
                // Initialize converter settings
                ExcelToPdfConverterSettings settings = new ExcelToPdfConverterSettings();
 
                // Convert Excel document into PDF document with the specified settings
                pdfDocument = converter.Convert(settings);
 
                // Save the PDF document
                Stream stream = File.Create("Output.pdf");
                pdfDocument.Save(stream);
            }
        }
    }
}

Imports Syncfusion.XlsIO
Imports System.IO
Imports System.Reflection
Imports Syncfusion.ExcelToPdfConverter
Imports Syncfusion.Pdf
 
Namespace Zoom_Ratio
 
    Class Program
 
        Private Shared Sub Main(ByVal args() As String)
            Using excelEngine As ExcelEngine = New ExcelEngine()
 
                'Instantiate the excel application object
                Dim application As IApplication = excelEngine.Excel
 
                'The workbook is opened
                Dim workbook As IWorkbook
 
                'Open existing workbook with data entered
                Dim assembly As Assembly = GetType(Program).GetTypeInfo.Assembly
                Dim fileStream As Stream = assembly.GetManifestResourceStream("Zoom_Ratio.Sample.xlsx")
 
                workbook = application.Workbooks.Open(fileStream, ExcelOpenType.Automatic)
 
                'The first worksheet object in the worksheets collection is accessed
                Dim worksheet As IWorksheet = workbook.Worksheets(0)
 
                'Set zoom value
                worksheet.PageSetup.Zoom = 50
 
                'Create an ExcelToPDFConverter instance
                Dim converter As ExcelToPdfConverter = New ExcelToPdfConverter(worksheet)
 
                'Initialize PDF Document
                Dim pdfDocument As PdfDocument = New PdfDocument
 
                'Initialize converter settings
                Dim settings As ExcelToPdfConverterSettings = New ExcelToPdfConverterSettings
 
                'Convert Excel Document into PDF document with the specified settings
                pdfDocument = converter.Convert(settings)
 
                'Save the PDF file
                Dim stream As Stream = File.Create("Output.pdf")
                pdfDocument.Save(stream)
            End Using
        End Sub
    End Class
End Namespace