How to prevent "world grid extents" from scaling Niagara fluid particles?

Hello, I’m trying to use a built-in Niagara fluid template called “Grid 3D FLIP Pool” (right click in Content Browser > Niagara System > New system from a template… > Grid 3D FLIP Pool).

To enlarge the system in the level, I increased the “world grid extents” user parameter. But it also enlarged the particle size. How can I prevent that?

This is the video showing before and after increasing the “world grid extents” parameter.

Increase “Num Cells Max Axis”.