Once an Assignment is complete and ready to be turned in, all the student needs to do is click SUBMIT at the top of the page. They do not need to adjust any Share settings. The SUBMIT button takes care of that for them.
To UNSUBMIT, simply click the UNSUBMIT button at the top of the page.
Once submitted, if a group member makes any changes to the page, they can simply click the “Make Changes Visible” button, or UnSubmit and Submit again, either option works.