After submitting the form, you can redirect to the following pages:
A modal to thank the user for submitting the form
A page that tells the user that the form submission was successful
Redirect to "Thank You Page"
select the form in the editor, and in the Box settings panel on the right side of the screen
select Redirect Page from the normal pages or modals in the project.
If you are using the BASIC plan, you can track conversions with Google Analytics if the redirection of the form is a normal page.
For more details, please see here.