Why does static mesh appear to be unloaded?

[alist_lee]

hello
May I ask how to handle Static Mesh’s “unload”?
Sometimes static mesh will program gray
And they can’t be seen on the game map anymore
May I ask how to solve this situation in general?
Many trees are not visible, only one tree is displayed

[ClockworkOcean]

You are using World Partition.

Just make sure that block is loaded

[alist_lee]

thank you very much