kubectl config set-context --current --namespace=<ns>
kubectl config set-context --current --namespace=<ns>
Risk: Careful
What it does
Changes the namespace your commands use by default.
When to use it
You work in one zone for a while.
Example
$ kubectl config set-context --current --namespace=foodFrom now on, work in the food zone.
Learn it in: Zones: namespaces · Official docs