Your administrator can set defaults that will apply to all assignments you create. One option they have is to automatically have Turnitin active.
Immediately: The similarity report will be generated as soon as a file is uploaded.
Immediately and regenerate on due date: A similarity report will be generated after a file is uploaded and then we will regenerate it on the due date. This is useful when looking for collusion within a group.
Due date: Files will only receive a similarity report on the due date of the assignment.
Index all submissions - This option will add files automatically to your organization's private repository. This makes them available to be matched against in similarity reports by other people within your organization.
Allow students to view Similarity Reports - This setting determines if students are able to see similarity reports that are generated.
Bibliography and Quotes - Allows you to automatically exclude bibliographies and quotes from the similarity reports. Want to know more? Check out the guide.
Process draft submissions - Use draft submissions? This setting will allow similarity reports to be generated for each draft of a submission.