The UserDefinedNetwork page lists UDN and CUDN objects.
UDN is namespaces scope, CUDN is clsuter scope.

The list view "namespace" column for CUDN objects presents "All Namespaces" which is confusing, making me think the CUDN selects all namespaces in the clsuter.

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1. Create CUDN, check "Namespace" column in the UDN page list view
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UDN page list view "Namespace" column present "All Namespaces" for CUDN objects

I expect "Namespace" column to not present "All Namespaces" for CUDN objects because its confusing.
I think its better for "Namespace" to remain empty for CUDNs objects.

The CUDN spec has namespace selector, controlling which namespaces the CUDN is affecting, I think this is the source for confusion.
Maybe having the "Namespace" column preset "All Namespaces" for cluster-scope objects make sense, but in this particular case I find it confusing.