I'm using lens kubernetes I searched and tried a lot but I didn't find any way to switch between namespaces. is there any option to do so ?
to clarify it in vscode extension you can switch between namespaces easily by right clicking on a namespace listed and then selecting use Namespace option 
also in kubectl using this command :
kubectl config set-context --current --namespace=my-namespace
but how can we do it in lens ?
If I remember correctly there is a dropdown on the top right corner which you can use to select the namespace from.
Here is a screenshot from a blog that shows this dropdown:

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