UE5 Editor only DataLayer

I’m got little confused with UE5 data layer.

In UE4 work with world composition, we can create a sublevel that never load at runtime(also never packing), so this sublevel is a pure editor only level.
For UE5 work with World Partition, we using the DataLayer, and place all editor only actor to this layer. But DataLayer looks doesn’t support editor only feature?
[IsRuntime] option just affect the runtime load policy, and still packing when cook.

So, Is that a good particle when work with World Partition?
Has any plan for DataLayer to support editor only feature?

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@ JoeRadak