I’ve just started looking at world partition and so far it seems to be working. but it culls/clips my landscape which isn’t behaviour i want. the ‘is spatially loaded’ checkbox is unchecked and greyed out.
i’ve tried creating a second partition for the landscape but that doesn’t seem to work at all.
how can i stop landscape chunks/tiles from getting unloaded?
essentially i would like actors to get streamed in and out but not the actual tiles of landscape.
thanks. 
I’ve been trying to figure that out too.
Landscape or background mountains obviously we don’t want them disappearing.
So if we go to World Settings -> Runtime Settings -> Runtime Partitions
we’ll see a partition named MainPartition
We can add another one and name it something like PersistentGrid, set the class same as the other. Then make its Loading Range really big (add a 0 or two). “Show preview grid” to show if it covers everything.
Then select the landscape actor -> Details -> World Partition, there’s a field called Runtime Grid. Set that to the name of our new PersistentGrid.
Now it stays visible, while other things still use the loading range of the other grid.
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