When im in the ‘levels’ tab, i set the visibility of a part of my landscape on, and once I do that, the engine turns other parts of the landscape off! Then, when i set the visibility on anotehr to on, it turns off the parts that were previously on. Pls help =),When in the ‘levels’ page, i turn one part of my landscape on, and the engine turns other parts off and on. Pls help =)