Damn I feel lost... knowing the original CK isn't much help here.
Starting as the king of France, I can press de Jure Claims for:
Vivarais, for Duke Guihèm IV of Toulouse and (owned by Prince-Bishop Girard of Vivarais)
Maine, for Duke Folques IV of Anjou (owned by Duke Robert I of Oxford)
How do I do that? What UI element?