It is not possible to take controls away from the student on Bramble. We have deliberately designed Bramble in such a way that the student has the exact same access to the tools available as you. This was to ensure they are consistently active and engaged within the lesson itself, rather than passively watching a screen.
However, if you are having any particular behavioural difficulties with a student, we advise getting in touch with your tutoring provider (if applicable) as they will be able to best guide you further and report the behaviour to the relevant people.