Thanks for posting in the Community.
You should be able to extract the students who do not have any schedule using the ''Section Enrollment Audit'' report in System Reports under Membership and Enrollment as listed below:
1. Go to the Start Page
2. Navigate to the System Reports
3. Select Section Enrollment Audit
4. Then run the report by clicking on 'Continue'
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There is also a PSCB Custom Report - Custom Reports (Schedule Current Year) on Power Data Solutions. The report you want is: Students - Non Scheduled Periods.