How Do I Move an Opportunity Backwards in the Workflow?

In order to move opportunities back to the Inspect & Personalize stage of the workflow, you need to turn on Approval Workflow from the General Campaign Settings.

When in Compose, select the opportunity (or multiple opportunities) you would like to move. Click the Reject button.

It is optional to leave a note explaining why the outreach email is being rejected. 

After completing the reject prompt, your opportunities will be waiting in the Inspect & Personalize stage.