You must be using or have used Connected Quizzing for classes in two different semesters to be able to toggle between them.
Log in to your CasebookConnect.com account and click on Connected Quizzing. Your most recently viewed semester will be displayed.
At the top right, under the Quiz Concierge button and next to the Connected Quizzing logo, you will see a dropdown menu with the label “Viewing.” Click the dropdown menu to toggle between semesters.