Good morning, @1advocatus ...
Are you a student? Are you looking at your "Courses" >> "All Courses" screen ... and then looking at the column that indicates if a course is "Published" or not (it would show "Yes" or "No" in that column)? I'm not aware of anything that says, "OFF", but I'm assuming you are referring to that "Published" column. See How do I view all my Canvas courses as a student? for more information and screenshots. If you are a student, your instructor will need to "publish" the course in order for you and your classmates to get access to the course content (including those announcements). This is the Guide that instructors would use to publish a course: How do I publish a course?.
I hope this will be of help to you. Sing out if you have any other questions about this. Take care, stay safe, and be well.
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