I don’t know if you guys found the solution to this already, but here it is:
So the check box for Is Spatially Loaded is grayed out for me on the Landscape Actor itself on the world outliner, however if you unfold the Landscape “Folder” in the outliner, you can untick the Is Spatially Loaded on the Landscape Proxies! (See pic below)
Now Keep in mind, that keeping everything loaded might eat your performance up, I’m currently exploring using a different Runtime Grid for the Landscapes that have a way larger loading area of cells, just for the landscape itself, not the actors on it.
Hope this helps anyone who hadn’t figured it out yet! 