True when this command is running inside a multi-participant route.
This boolean flag (bool) belongs to FInteractionCommandExecutionContext under Interaction|Execution.
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 = "Interaction|Execution")
bool bHasMultiParticipantSession = false;