Disabling DH for nearby chunks

I want to change when DH starts working. Currently DH works good but it also turns objects into low-poly when they're actually within my regular render distance. I'm in a server and my render distance is 10. I have other questions as well like a side of some blocks in mountain range is empty but it's only for a couple of blocks and the pattern isn't repeating whatsoever, but I just need answer to the first.
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