Hello,
unfortunately, the game does not support that.
We can not do mod for world editing.

Adding this to world generation on top of placing them manually would be amazing. You should also add it into world editing page.

Great it was not an issue. This hills mod has not the simpliest way of working but i do not find how to do it better. I see you use several of my mods 😁 thank you

Ok bruh, i get it now, the houses are always green blocks, and the park area is what gives it shape. I had misunderstood. I thought the houses transformed their floor into the textured hills, but you have to give it shape with the "hills" to cover up those green blocks of the house, right? How stupid am I? xD

Well, I created a new world with the mods to test the problem and I still see the hills as green blocks without texture, so I guess it's a compatibility issue, idk

Hi, sorry for the late reply. I play in the first biome, but I don't remember what it's called, "Templade." I have the following list of mods:
Embassy_nppk28
Hills
Camping_v1_4_nppk28
Wide Roads mod v1.1
Medieval_Bruko
Pyo's Decorative City Walls
The Industrial Mod v2.2
Vintage Car Meets + Modules v2.1
Outdoor leisure
Sports and event complexes
Fun_Park
CherryTrees_Bruko
Canals (And Houseboats!)
*Outdated* Pyo's Decorative Rail Mod
Zoo
More farms

It's worth noting that I play in sandbox mode and added the mods to an already advanced map because I wanted to make my city more attractive. So, perhaps the problem is that I didn't start a new world with the mods, but rather added them to one with a game already in the year 600.

I deleted the folder so the game dowload the online version (so i'm sure i have the same version just in case i change some things to test on local).
I checked only hills mod and start a standard game in temperate biome.
It works well.
What others mods do you activate in the same time and in what biome you play so i can test with the same condition ?

i tried this mod and it only shows me green blocks instead of the Hills that are seen in the images, i mean without the texture, how do I fix it?