From my understanding of the forms portal in AEM, you can only see drafts & submissions submitted by yourself.
In the use case where someone with a group admin role wants to see all drafts & forms submitted from their group, how can that be achieved?
Check out https://experienceleague.adobe.com/docs/experience-manager-64/forms/manage-administer-aem-forms/form...
The group forms-submission-reviewers is probably close to what you want to do. You can use the permissions of this group as a template