Currently, in Team Managed projects, it is not possible to make the 'Description' field mandatory or remove it.

While we acknowledge that this field is integral to the system and carries certain restrictions, we believe that providing users with the ability to make this field required or remove it, based on project requirements, would significantly enhance the flexibility and customization capabilities of Jira Team Managed projects.

Workaround

You can set a Rule on each transition to mandate data in the 'Description' field, but this rule cannot be applied to the Create transition. Consequently, new issues may be generated without a 'Description', although they would be restricted from transitioning to other statuses if the rule is applied to all other transitions. An alternative is to employ an Automation Rule to inspect each newly created issue for 'Description' content, triggering an email notification if created without information. Additionally, a workaround involves adding a Custom Paragraph field named 'Required Description', but you cannot eliminate the original 'Description' field, potentially causing confusion due to the coexistence of two fields.