Should you wish to disable the integration with Zoom you simply need to:
Sign in to your system
Navigate to Settings>Diary>Integrations
Click 'Unlink E-Clinic & Zoom'
You can also unlink from within your Zoom Account,
Login to your Zoom Account and Navigate to the Zoom App Marketplace
Click Manage>Installed Apps or search for the E-Clinic App
Click the App
Click Uninstall


