why does my web browser's PrintPreviewDialog display become small when loaded in vb.net

Question

I don't know why the size is small, is there something wrong or is there a way with the code so that the display becomes normal.

Thanks

 Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
           Using dt = LoadData("A")
            myWebBrowser.DocumentText = DataTableToHtml(dt)
        End Using
    End Sub
    Private Sub myWebBrowser_DocumentCompleted(ByVal sender As Object, ByVal e As WebBrowserDocumentCompletedEventArgs) Handles myWebBrowser.DocumentCompleted
        myWebBrowser.ShowPrintPreviewDialog()
        'myWebBrowser.Print()
    End Sub

 

code in designer

    Friend WithEvents myWebBrowser As New WebBrowser

update code

   Private Sub Form2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    myWebBrowser.Parent = Me
End Sub

result after update code