If you'd like to leave your assignment in a draft state or just don't want students to view all the assignments yet you can change the status of the assignment.
- Go to your assignment settings
- On the left hand side find the status box.
- Click on on the Edit button in the sidebar.
- You now have the option to set the status of your assignment to hidden from students, visible to students or schedule it to publish on a given time & date.
- Click Save.