Is there a setting that allows students to belong to more than one group? If so, where is that setting? Thanks!
not for the same set of groups. However you can have multiple group sets in a course. For example you can have "Final Project Groups" and "Discussion Groups" that are separate. But the same student can not be in two groups in the same set.
There is a feature idea that is open for voting for this functionality you may want to vote on: Allow students to be enrolled in more than one group within a group set
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