Editing published questions between sessions

[akling1]

Greetings! I'm the instructor for an adult, non-credit course that we offer twice a year, and after several sessions, it's now time to refresh portions of the quizzes. But I get a warning from Canvas ("Students have either already taken or started taking this quiz, so be careful about editing it. If you change any quiz questions in a significant way, you may want to consider regrading students who took the old version of the quiz.") that keeps me from making changes to individual questions. There are no active students at the moment -- just the "Test Student" in the gradebook. Am I missing something? Thanks!