IMPORTANT NOTE: this article explains how to disable the app, it does not explain how to uninstall the app. When you disable the app, your subscription remains active. If you need to uninstall the app, check this article instead.
To disable the app, open the app and find the Settings > Assets menu and click Install scripts & assets:
Next, find the "Disabled" option for the live theme and click it.
The app will ask to confirm.
To enable the app, go to the same section and switch back to App embed or Asset mode.