Students able to advance to next lesson even though it is "hidden"

Can anyone steer me in the right direction?
This week, it has come to my attention my students are able to advance to the next lesson even though I have all of the lessons marked “hidden” except for the one we are currently working on.
This is my 3rd year using the CSF curriculum. The only difference this year is that I linked to Google Classroom. Could this be the issue?
Thanks tribe!


My initial questions are: is it all students? is it possible that the students are in another teacher’s section?. If you report it through, someone will be able to walk you through all the questions so we can get things working for you.

Happy computing, Andrea

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