You can skip Formcubes' default thank you page with your own. To do that you need to provide your own dedicated thank you page on your website, whenever a submission is successfully received visitor will be redirected to thank you page on your website.
Login to Formcubes' admin panel
Open your form workspace > Form Setting > Custom Thank You Page Setting
Check "Enable Custom Thank You Page"
Enter your custom thank you page URL on the "Your custom thank you page URL" field.
We send the submission ID value to your custom thank you page by passing it through URL parameter under
submissionID key. You can parse the parameter and show it in your custom thank you page.
To disable custom thank you page you only need to leave the "Enable Custom Thank You Page" unchecked and click "Save"