Hierarchical LOD System is disabled in (sub-)level,unable to build LOD actors

If I moved the Actor to any Sub-Level,its can’t Generate Clusters.

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I’m Enable the World Composition

But it’s worked well in Mainlevel.

Please double Click sub-Level in Content Browser and enable HLOD in WorldSettings

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As anonymous_user_f6fef7e3 has said, each individual sublevel needs to have HLOD generation enable in its world settings. This was only for pre-UE5, and in UE5 it’s actually preferred to have some sublevels which don’t have HLOD generation enabled (to exclude them from generating HLOD clusters; there are no warnings if no sublevels have HLOD generation enable, for instance, and HLOD generation will only occur for the p-level at that point if it’s the only one with generation settings enable in its world settings), whereas in pre-UE5 any sublevel with mesh actors needed to have HLOD generation enabled to generate the clusters for any level, or this warning would result.