In the Folder Properties page, you will notice an option to Change or Manage Workflows. You can select Manage Workflows to access the Review and Approval Workflow Module to set up a Review and Approval Workflow, or you can select Change to assign one.
Figure 1: Select a configured Workflow in the Assign Workflow page.
Usage
Once you have selected Change, you can assign your Review and Approval Workflow in the Assign Workflow page. Simply select one of your configured workflows in the Select Workflow drop down menu and select Assign or Cancel. If you have not configured your Review and Approval Workflow yet, you will need to select Manage Workflows and read more about Configuring Review and Approval Workflows.
You should be aware that "None" is an available option to you, if you decide to remove the assignment of a workflow to any Project.