This option can allow students to use their eNotes on assessments. Each assessment has its own independent settings so it can be customized to allow eNotes on all or only what is checked.
For exams, if Allow eNotes on Exams is checked, eNotes are available for the unit being tested. eNotes from previous units are not available because the content from previous units is not tested on the exam, therefore notes from previous units are unnecessary.