Questions about build tiled model

[marstears]

Hi
I use metashape 1.8.4 to build a tiled model for an university compus.
The tiled model was perfect when I set the "Tile size" option to 256, but there was many structure and texture errors when I set "Tile size" to 8192.  And the LOD changed form 11 to 3. Pictures in attachment shows their differents.
I think the "Tile size" option means the texture size, and I want to know why does it affect the effect of the tiled model model?
Are there any options can control the real "Tile Size" of the tiled model? For example, the whole tiled model could divided into several tiles of 100 meters X 100 meters.

Thanks.