The red rectangles on the line of a course

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Taking this example image showing a group course in Modern Art as a reference, the red rectangle on the left (on the ID) means that the class schedule has not yet been planned; while the red rectangle on the right (on the Enrolled), means that the minimum number of enrolled students for that course has not been reached or the maximum number has been exceeded.

Once the course is planned and the appropriate number of students are enrolled, the two red rectangles will disappear.