Hi Marie
Until you get a new form, you do not need to anything for now, but it is a good idea to start collecting supporting documents togeter. If you are on contribution based ESA and in the support group then you stay on that award until you are reassessed and your entitlement changes, i.e you are put in the work group or found fit for work, if nothing changes then you stay as you are.
Gary
Nothing on this board constitutes legal advice - always consult a professional about specific problems