What are the "User Mode" tools in kubernetes lens?
I have not used it, but the description in your image is understandable. It is adding RBAC (user permission) so that any user (also non-admins) can list namespaces (e.g. see all namespaces that exists within the cluster).
But it should not mean more than that, e.g. a user can not create a Deployment in a namespace he is not granted to.