There are a couple of ways of uninstalling the Canto Adobe Connector
Adobe Creative Cloud
To remove the extension via Adobe Creative Cloud:
Open your Creative Cloud app > Marketplace > Manage Plugins > click on the icon with 3 dots > Uninstall
Windows
To remove the extension on Windows go to:
C:\Program Files (x86)\Common Files\Adobe\CEP\extensions\
Next, remove the folder titled com.canto.adobeconnector and you're all set!
Mac
To remove the extension on macOS, go to:
/Library/Application Support/Adobe/CEP/extensions/
Next, remove the folder titled com.canto.adobeconnector and you're all set!