How do I make semi-buried structures/structures with hidden subfloor?

Hi, I'm trying to add a structure in my mod, structure which has a hidden basement like igloos, but I have the problem that I can't make the structure appear buried enough to hide this subfloor.

I was looking for a tutorial to achieve this and I got one in my language where I noticed that the youtuber had some options to modify the XYZ position of his structure, but I don't have these options in my MCreator. Does anyone know how to get these options or some other means to get my structure semi buried?