Cannot unlock visibility in Editor

[UZERO]

I’m not so sure because I don’t have a lot of experience using the world partition function.

But I found this article.

Can You Remove World Partition From a Level?

Can you remove World Partition from a Level? Article written by Joe R. Simply put, no, once a level has been converted to World Partition, you can not revert it back to a normal level, or World Composition level. If you wish to try using World Partition on your level, but aren’t sure it’ll be right for what you want, then it would be recommended to make a backup of the level you want to use World Partition on, and then convert the level to World Partition. If you find that it doesn’t work out…

How about make new level and copy and paste all actors into it?