How can I make the Description and Success Criteria fields as required fields?

Use Visual Builder Studio to set some fields as required fields.

1. Edit the New Goal or goal details page in Visual Builder Studio.
2. Select a project.
3. In Express mode, click the Configure Fields and Region button.
4. Expand the Form Rules region.
5. Add or edit a Regular form rule and give a suitable name and description.
6. Ensure that the rule is active.
7. In the Regions and Fields section, expand Goal Details.
8. Expand the performanceGoalsV2 resource.
9. Locate the Description field and set its Required property to Required.
10. Locate the Success Criteria field and set its Required property to Required.
11. Preview your changes and publish.