When the automated enrollment process adds a Student to a Group, it normally also enrolls that Student into the Subjects taught in the Group. This setting narrows that second step: with it enabled, only the compulsory Subjects are enrolled, and the optional ones are skipped.
The full article is available to signed-in Classter users.
Sign in with your Classter account — if you are already signed in to your Classter Portal you will not be asked for credentials.
Sign in with Classter