Hi @dacampelo,
I believe the web and smart clients are intended to be used by the same type of user so there would not be the same ability to restrict access to one or the other as there is for a tech portal user or customer portal user for instance.
Depending on how you are setup you may be able to restrict the specific user from accessing the smart client link itself but still allow the traffic to the web client.
I am not aware of anyone separating users between the smart and web clients before though so not sure what would work. Usually I see that the tech portal has been used instead as a restricted form of access for back office workers. Would that be an option?
Kind regards,
Lee Pinchbeck