When configuring the Participate iOS SDK, you can choose between two modes that allow for different features. They'll each have a small impact on your compiled app size.
This mode will enable Self-test feature in your app. But It will not work with Live.
Live + Self-test: 17MB
This mode will enable both Live and Self-test feature in your app. There is currently no way to decouple Live as separate mode in the SDK.
If this is too much, you could consider excluding Lookback from your main app, but keeping it in your beta builds (e g when distributed over TestFlight).