Hi Max101,
You can find this by opening up the “Content Examples” project downloaded from the Marketplace > Open Map > Effects.umap.
This is the location of the particle effects map that has them all in one location.
Since these are just shown in one place (the effects map) these elements are actually available in the content browser as soon as you open the Content Examples project. You would just need to known the name of the particle or you can alternatively search by filtering only to see “Particle Systems.”
Thank you!
Tim