By default, a project assignment is not available to others until you explicitly publish it. This ensures that you can make changes, even after publishing, without the published course content being affected.
Publishing the assignment takes a snapshot of the underlying project and assigns it a new version. Once published, you can make changes to your project and it will not affect the published assignment until you publish again.
Go to the Courses section on the dashboard and select the course.
Go to the Edit tab
Click on the assignment name to open and make changes to it.
When done, click on the Publish button that will show at the top right of your menu bar or go to Education->Publish Assignment to publish the assignment
Enter the changelog text, which is a description of the changes made since the last publish, and select the Publish option.