Can I see the visitors who did not complete the email validation process?

Yes, the visitors who did not confirmed their email address will appear in the Pending Petitioners page at Settings > Pending Petitioners. You will be able to see the info they entered in the form’s fields and you can choose to either Approve the petitioner or Delete him. If you approve a pending petitioner, he will be considered as a petitioner who confirmed his email address and will appear in the Users section with the role Petitioner. If you delete a pending petitioner, he will disappear from the list and he will have to register again.