In the detail view of your project, next to each Prevue you will notice some management options. These include Replacing, Managing Annotations, Deleting and Removing. There are important differences to these latter two.

Removing - This will remove the current Prevue from this project and will file it in your Library as an Individual. No data will be lost, and you can return the Prevue to this or any other project by following these instructions.

Deleting - This will delete the Prevue, and all attributes, versions, stats and annotations associated with it. You will be asked to confirm this before you continue.

Prevues are deleted immediately and cannot be restored.