How to make it so you can build on a secondary landscape?

I created another landscape farther off the map that I can teleport to but for some reason I cannot build on it. I’ve tried deleting it and rebuilding it several times, i’ve looked through all the settings but I still can’t see a way to make it so I can build on it. Perhaps these settings should be easier to find. If anybody has any answer that would be helpful that’d be nice too. The terrain isn’t even underwater or anything