True when this prompt belongs to a multi-participant route or session.
This boolean flag (bool) belongs to FInteractionUIPromptContextPresentation under InteractionUI.
Runtime and UI code should treat this as resolved state from the owning object. Read it to present, branch, or debug behavior without re-authoring the underlying interaction data.
UPROPERTY(BlueprintReadOnly, Category = "InteractionUI")
bool bHasMultiParticipantSession = false;