Items that appear in light gray on your course navigation menu are still clickable by you as an instructor. If an item is light gray it indicates that it is not currently visible for students.
There are two reasons:
- You have hidden the link in the navigation menu through the course settings.
- There is no content in that particular tool. For example, announcements will remain gray until you create the first announcement for the class, at which point it will become visible for students.