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How to fade out particle without destroying it?

I got a smoke grenade that plays the smoke particle system, then after 10 seconds I put destroy actor.

It destroys the smoke grenade but the smoke that is left instantly goes away instead of just lingering off until it fades.

How could I make the smoke just fade away instead of instantly disappearing?

What is the lifespan of the particles?

Maybe have the particle system seperatly attached and detach after the grenade is destroyed? Or hide the grenade mesh first then after the particles have finished then destroy the actor.

Figured it out, the deactivate node worked for it. The smoke naturally dies out on its own now.