How do I prevent particles from spawning on start of layout?

Hi,

I have one particle object set to one-shot. It isn't supposed to appear until an event is triggered, but no matter what I do it also spawns a few seconds after the layout starts. Setting it to invisible makes no difference.

Do you mean it is in the layout in editor and then it appears during run time? That's intentional but you can destroy it on start of layout.

Thanks, lionz.