You can see which students have joined your class by clicking by the class you want to see data for and then selecting 'Students'.

You will then be able to see a list of the students in your class.

From here you can invite parents and by clicking the checkbox you can remove the student from the class.

If these aren't showing as you expect, hit refresh to load the latest data to your class.
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You can find your students list by entering the class and clicking students on the right hand side. As a synced school, students are automatically added to your class based on the sync data so you cannot remove students from your class.