Ma intendi la lightsaber a doppia lama o proprio due lightsaber contemporaneamente? E' passato del tempo ma non ricordo problemi nell'utilizzarla, comunque ho trovato questo
its C to go double-bladed and x to go single-bladed on keybord.
On controller, left on the d-pad is for single blade and right is for double blade. If you tap the button that you're already on, it turns the lightsaber off. C must be the single blade button, so maybe x is the double blade button