Should you wish to disable the integration with Zoom you simply need to,
Sign in to TM3
Navigate to Settings>Diary>Integrations
Click 'Unlink TM3 & 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 TM3 App
Click the TM3 App