Embedded interface - Form Complete - The form has been successfully submitted.

Hello All, 

Need help related to an embedded interface.

We have interface embedded in a public website and in that Appian form we have Submit and Cancel button. 

Submit is true and validation is false for Cancel button 

When we click cancel then we terminate the process but after that, it shows 'Form Complete - The form has been successfully submitted'  

How to disable this error message and display another embedded interface.

Thanks in advance.