Why do atmospheric partitions occur?

Why does the atmosphere partition appear? I added atmosphere to the world scene. It seems that there is something wrong with the atmosphere, because after I turned it off, although there was no atmospheric effect, the partition effect was also gone.

If you mean the fog, its got a controllable falloff to lessen the effect of it.

Really its part of the athmospheric fog.
Theoretically a custom PP could lead to even better results.

Best videos for it are probably Sjorden’s explanations from 5 to 6 years ago.
Should be in the learn tab under lighting for volumetric lighting.

Thank you for your answer. I seem to have found the problem. Because my terrain is too low, and I lowered the height fog position, which may lead to the phenomenon in the picture.