After you add the Babel plugin, restart your development server and clear the bundler cache: expo start --clear.
Note: If you load other Babel plugins, the Reanimated plugin has to be the last item in the plugins array.
The new APIs in react-native-reanimated@2 use React Native APIs that are incompatible with Remote JS Debugging. Consequently, you can only debug apps using these APIs using Flipper, which is not yet available in the Expo managed workflow. You will be unable to use Remote JS Debugging if you use the new APIs from Reanimated 2. Remote JS Debugging will continue to work if you only use the APIs that were also available in Reanimated 1.