An Entity can have a single physical representation. ParticleSystem can be turned on and off with active (which is distinct to entity visible flag). Effect derives from Entity so if you have a Effect you can do any of these functions as well as the functions in Entity. You can do entity:IsA(Effect) to see if a particular entity variable is a Effect type entity.
||Set whether the particle system is emitting particles or not.|
||EffectAsset on this entity|