In order to revoke access to your profile to a selected Healthcare Professional go to My Doctors section in the Menu and find the desired Professional Name, then click three dots next to it and choose an option to Revoke access.
Please note, that all the data synchronized to date with the Healthcare Professional are already copied to the Clinic and will remain accessible to Healthcare Professionals there.
In similar way you can revoke the access to your Profile for Caregivers. Go to My Family section in the Menu and find the desired Caregiver. Next choose three dots and select Revoke option. This person will loose access to your profile.