Allow to visualize the activity (s) in which the members of a group are registered. This visualization should be simple and fast, such as displaying a column with details of the activities concerned displayed by clicking or mouseover on the number of activities in which the member is registered, for example. This column can also be displayed only on demand (group property) so as not to make the table of all groups heavier for all.
This need arises from the need to make sure that each group member is at least registered in one activity and see which one (s) without opening everyone's form.
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