The change can be done through Administrator site.
Login, navigate to Home > Accounts > Account Name > Processes > Click on the step that needs to be renamed > update the Title field with the new name.
3. Once the activity name is updated, the change will reflect in the Onboarding instance.
Rename activity, change step, update activty name., KBA , LOD-SF-OBD , Onboarding , How To
SAP SuccessFactors Onboarding all versions