Hi, here’s the answer: https://forums.unrealengine.com/deve…initive-answer
So you can change the z-scale of your landscape to go beyond the height limit but of course you will lose precision by increasing the z-scale (UE saves the heightmap into a 16 bit texture, so you can have around 65k height steps) and you can’t really change this once you have started sculpting since it is changing the scale of the landscape and will therefore also affect what you have sculpted so far.