On the Results tab of an assessment, the option:

"Show results page only after all Students have submitted at least one attempt"

should cover students in all sections who are taking the same assessment. Otherwise, the students from the class that meets in an earlier period can get the correct answers to show to the students that meet in the later period.

I know we can just keep it toggled off until the end of the day and then turn it on, but it would be nice to have a toggle for it.