In this video I’m going to show you how to solve a common problem that people new to Niagara face, and its about the particles disappearing from the screen, plus other useful informations for newcomers.
https://dev.epicgames.com/community/learning/tutorials/ZD4w/unreal-engine-how-to-fix-particles-disappearing
Particles disappearing in your project can be frustrating. To fix this, first, check your particle system settings, ensuring they’re not set to self-destruct or have a short lifespan. Next, verify your camera’s culling settings, ensuring particles aren’t being culled out of view.