Starting today, you can enable RStudio on Amazon SageMaker on your existing Amazon SageMaker Studio domains. This eliminates the administrative burden of decommissioning and re-creating your Studio domains to enable RStudio on SageMaker. You can also select whether all user profiles in the domain have access to RStudio on SageMaker by default or enable it for specific user profiles individually. You can set the type of access your users have in RStudio (i.e., user or administrator access).
Source:: Amazon AWS