How to delete a templated assessment
Templated assessments cannot be deleted but they can be archived. The reason for this is that when there is a history of completed assessments associated with a template, deleting the template would delete the assessments as well. Therefore, you can archive a templated assessment which will not impact the completed assessments associated with that template.
How to delete a completed assessment
If you conducted an assessment and submitted it, the assessment will appear in the Completed tab. To delete a completed assessment, go to Performance Tools > Assessments > Completed tab and you will see a list of completed assessments.
Click on the three dots to the right of that assessment and then click on Delete.