Note: You can use this system nav bar to keep students from accessing the content and other areas of your course until you are ready for them to access it. This nav bar limits them to the homepage, where you can post an announcement telling them when the course will be ready. The only link in the navbar that they will have access to is the classlist.
Note: This also changes your navigation bar to Classlist and Course Admin. To access Content and other tools, click Course Admin.
When your course is ready, simply repeat the above process, selecting your prefered navbar from the Active Navbar drop-down list, and click Apply.