Good Day! You would want to make sure that the maximum number of courses to select is set to a number equal to/higher to your elective subjects.
You can navigate through the following path:
Start Page > PowerScheduler > Screen Setup > Grade Request Screen Setup for 2022-23/2023-24 - Grade Electives.
Additionally, I recommend reviewing these articles that will help you troubleshoot this issue further
These articles are limited to PowerSource users or technical contacts. You would want to reach out to the technical contacts of your school district who can help you review this information.
Please let me know if this helps or in case of further questions.
Kudos encourage participation