You can add additional branches for Windmill to monitor.
Make sure your project repository is already at the branch you want to monitor.
For any additional branch to master, Windmill will provide you with error and test failure highlighting.
When you are done working on a feature branch, Close the Window (⌘W) to have Windmill stop monitoring the branch.
It is recommended that Windmill always monitors the master branch so that you always know you can install your app on a device and release to the App Store.