If you include a link to a tool in a content area, the tool’s content must be made available before students can access it.
If an item is visible that you do not want students to see, change Edit Mode to ON and make the item unavailable or delete it.
If possible, log in as a mock student so you can experience the course exactly as a student does. Work through your course content and activities, and try out the tools. You may find something is not functioning as you want, helping you resolve issues before students encounter them.