The 'not completed' indicator is a useful tool to see how engaged your students were with your lesson, and the meaning is situational depending on where they interacted with your content.
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When looking through the results of a lesson shared in a module with your students, 'not completed' means that a student has not viewed the slide through the lesson overview in their LessonUp environment, via the student app (www.lessonup.app).

For a lesson taught in class, 'not completed' indicates that a student did not have LessonUp open during that section of the lesson. This could be because they had another tab or program open instead!