How to keep the Nanite triangle percentage reduced while Choas Fracture?

How to keep the Nanite triangle percentage reduced while Choas Fracture? I set the triangle percentage of a static network entity with Nanite support enabled to 5%. My aim was that after Fracture, the disk space of the Chaos Geometry file would not be too large, but at the moment of rupture, The Nanite triangle percentage is back to 100%, and I find that the nanite percentage reduction is only visual, not a real reduction in the model. Is there any way to apply nanite’s triangle percentage reduction operation to the volume of the grid not just visually, because a chaos geometry takes up 100mb of disk space, which is unreasonable.