Info about your currently configured clusters and contexts referring to each of these contexts is stored in ~/.kube/config . You can browse this into with:
kubectl config view
For contexts, scroll down to the contexts section.
For your currently configured context:
kubectl config current-context
To switch to another context:
kubectl config use-context contextname
Related info on kubectl: https://kubernetes.io/docs/tasks/access-application-cluster/configure-access-multiple-clusters/