Group choices let you put something to a vote amongst the users present in the scene. This enables a choose-your-own-adventure style interaction where the group decides what happens next based on a predetermined set of choices.
The example scene FlipsideCreatorTools/Examples/Example-GroupChoice shows how a group choice can be set up. To add it to your sets, drag the GroupChoiceElement prefab from FlipsideCreatorTools/Resources and customize the options and associated events as needed.

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