Collision Collection

– In these examples the green objects (named in the Outliner as “Umbrellas.green”) and the blue ones (nemed in the Outliner as Umbrellas.blue) are all set as colliders.

– The Collection selected is the only one that interacts with particles.

– In the Outliner you can see the two collection:

Blender Particles Outliner Collection
Blender Particles Deflection Collection