$.ajax({
                        type: "POST",
                        data: data,
                        url: "IUA/Submit",
                        success: function (result) {
                            if (result.Id !== 0) {
                                alert("Your application has completed the review phase and is confirmed complete. Your PIN will be " + result.Id + ". To complete your submission, please click the OK button below.");
                                $('#loading').hide();

                                kendo.drawing.drawDOM($("#mainDiv"))
                                    .then(function (group) {
                                        // Render the result as a PDF file
                                        return kendo.drawing.exportPDF(group, {
                                            paperSize: "auto",
                                            margin: { left: "1cm", top: "1cm", right: "1cm", bottom: "1cm" }
                                        });
                                    })
                                    .done(function (data) {
                                        // Save the PDF file
                                        kendo.saveAs({
                                            type: 'POST',
                                            dataURI: data,
                                            fileName: "IUAEnrollment.pdf",
                                            proxyURL: '@Url.Action("SavePDF", "IUA")',
                                            forceProxy: true,
                                            proxyTarget: "_blank"
                                        });
                                        displayLoading("#formDiv", false);
                                        location.reload();
                                    });
                            } else if (result.IsDuplicateRec == true) {
                                $('#loading').hide();
                                $("#divDuplicate").show();
                                $("#captchaDiv").load(location.href + " #captchaDiv>*", "");
                            } else if (result.IsMVCCaptcha == false) {
                                $('label[for="lblCaptchaErr"]').show();
                                $("#captchaDiv").load(location.href + " #captchaDiv>*", "");
                                setTimeout(WaitUntilLoad, 6000);
                            }
                        },
                        error: function () {
                            $('#loading').hide();
                            alert("Error occured during the submission. Please contact helpdesk.");
                        }
                    });

    let pdfOptions = {
        paperSize: 'a3'
        landscape: true,
       

//something like this
      printOptions = {
             fitContentToPrintArea: true,
             paperSize: 'a4'
       }
    };

        kendo.drawing.exportPDF(root, pdfOptions).done(function (data) {
            kendo.saveAs({
                dataURI: data,
                fileName: fileName
            });
        });