I have observed a few areas throughout Populi where there is no cancel button option. For example, when adding a lead in the admissions tab and it comes up that the person you are adding is already in the system. Sometimes, you do not want to override this previous information by adding to it or you do not want to create a new profile, the only way out of this is to close out of Populi or leave the page.
Another area is when you are in a student account and you click record a payment, you must leave the page in order to not go through with the act of recording a payment. Lastly, when in the student financial aid tab and you click refund aid, if you decide not to do so, you do not have a cancel button option either.