In order to be able to move opportunities back to Personalize, you'll want to turn on the Approval Workflow setting for your campaign.
With Approval Workflow turned on:
- When in Compose, select the opportunity (or multiple opportunities) you would like to move.
- Click the 'Reject' button. Optional: Leave a note for why it's being rejected
- After completing the reject prompt, your opportunities will be waiting in the Personalize stage