Hi @desintadewir and welcome to the Community! There are a number of ways that students can be allowed to join a course, depending on institution policy and instructor needs. We do use the join code option for clubs and other non-academic courses. However, the join code still needs to be made available to students somehow, so this is normally sent to the student so when they use the code they can select to be a part of the class.
Are you having a particular issue with this process? If so then perhaps someone here has a suggestion but ultimately it would be the institution and/or instructor who needs to make a change.
I hope this helps and best wishes!
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