To delete (= cancel) your OneDoc pro account from the mobile-app, you need to send a written request to our OneDoc support department, who will then guide you through the next steps.
You can read all the conditions relating to the cancellation of your pro OneDoc account from our privacy center: https://privacy.onedoc.ch/fr/professional-terms-and-conditions
Paragraph 17 of the "Terms of use for healthcare professionals" deals in particular with this topic and provides all the relevant information.