Export PDF fit to one page

I am using the following code to export certain worksheets. When I export the file(s) the worksheets don't fit to one page (A4) individually. I would like the exports to export as PDF individually put make them fit one a single paper.

the code is as follows:

Option Explicit
    
Private Sub CommandButton1_Click()
  Dim xSht As Worksheet, xFileDlg As FileDialog, xFolder As String, xYesorNo, I, xNum As Integer
  Dim xOutlookObj As Object, xEmailObj As Object, xUsedRng As Range, xArrShetts As Variant
  Dim xPDFNameAddress As String, xStr As String, rngExp As Range, lastRng As Range
     
     xArrShetts = sheetsArr(Me) 'do not forget the keep the sheetsArr function...
    
     For I = 0 To UBound(xArrShetts)
        On Error Resume Next
        Set xSht = Application.ActiveWorkbook.Worksheets(xArrShetts(I))
        If xSht.Name <> xArrShetts(I) Then
            MsgBox "Worksheet no found, exit operation:" & vbCrLf & vbCrLf & xArrShetts(I), vbInformation, "Kutools for Excel"
        Exit Sub
        End If
     Next
    
     Set xFileDlg = Application.FileDialog(msoFileDialogFolderPicker)
     If xFileDlg.Show = True Then
        xFolder = xFileDlg.SelectedItems(1)
     Else
        MsgBox "You must specify a folder to save the PDF into." & vbCrLf & vbCrLf & "Press OK to exit this macro.", vbCritical, "Must Specify Destination Folder"
        Exit Sub
     End If
     'Check if file already exist
     xYesorNo = MsgBox("If same name files exist in the destination folder, number suffix will be added to the file name automatically to distinguish the duplicates" & vbCrLf & vbCrLf & "Click Yes to continue, click No to cancel", _
     vbYesNo + vbQuestion, "File Exists")
     If xYesorNo <> vbYes Then Exit Sub
     For I = 0 To UBound(xArrShetts)
        Set xSht = Application.ActiveWorkbook.Worksheets(xArrShetts(I))
        
        xStr = xFolder & "\" & xSht.Name & ".pdf"
        xNum = 1
        While Not (Dir(xStr, vbDirectory) = vbNullString)
            xStr = xFolder & "\" & xSht.Name & "_" & xNum & ".pdf"
            xNum = xNum + 1
        Wend
        Set xUsedRng = xSht.UsedRange
        If Application.WorksheetFunction.CountA(xUsedRng.Cells) <> 0 Then
            Set lastRng = xSht.Range("A" & xSht.Rows.Count).End(xlUp)   'determine the last cell in A:A
            Set rngExp = xSht.Range(lastRng.Offset(-26), lastRng.Offset(, 7))  'create the range to be exported as pdf
            rngExp.ExportAsFixedFormat Type:=xlTypePDF, Filename:=xStr, Quality:=xlQualityStandard 'export the range, not the sheet
        End If
        xArrShetts(I) = xStr
     Next
    
     'Create Outlook email
     Set xOutlookObj = CreateObject("Outlook.Application")
     Set xEmailObj = xOutlookObj.CreateItem(0)
     With xEmailObj
        .Display
        .To = "Administratie@holwerda.nl"
        .cc = "Gerben@holwerda.nl"
        .Subject = "????"
        For I = 0 To UBound(xArrShetts)
            .Attachments.Add xArrShetts(I)
        Next
        If .DisplayEmail = False Then
            '.Send
        End If
     End With
    End Sub

The second line of code:

Private Function sheetsArr(uF As UserForm) As Variant
  Dim c As MSForms.Control, strCBX As String, arrSh
      For Each c In uF.Controls
            If TypeOf c Is MSForms.CheckBox Then
                If c.Value = True Then strCBX = strCBX & "," & c.Caption
            End If
      Next
      sheetsArr = Split(Mid(strCBX, 2), ",") 'Mid(strCBX, 2) eliminates the first string character (",")
End Function

The last line of code is to close the userform through a button:

Private Sub CommandButton2_Click()
    Unload Me
End Sub