At least, this needs a second thought (or the wording is ambiguous): A person can be a participant in one group (and have personal notes there), but be an owner in others.
The roles "student" and "teacher" are deliberately non-exclusive in AlekSIS.
But, I wonder if combining this with #137 (closed) (i.e. adding the functionality in #137 (closed) to "My overview") might be a better solution than removing the view for non-participants?
I think it would be a better solution to split up the functionality into two views because, as you already said, there can be a situation in which a person is a teacher and a student = has personal notes and made entries to the class register.
That does not justify two views, but rather two tabs in the same view (what exactly is not "my overview" about a view that shows all lessons I give as a teacher/group owner?)