How to make rain splashes in Niagara in UE5 ? Need rain splashes to hit objects

I am following tutorial (https://www.youtube.com/watch?v=qmZCW7eQ6rc&list=PLNTm9yU0zou5o5puKFfNjFUeTE0wBVwOA) I have worked out that my collision in the world is fine; but the “splash” particle should not be still hanging after I have enabled collison and used generate/receive collision event to communicate that the splashed should appear when the raindrop collides with an object. This is still evidently possible to make in UE5 from several other tutorials with the same thing in UE5, is there a setting that needs to be changed so the particles spawn on top of any collision ?