The "master" configuration is from Unity, as you stated in your comment and it is used to submit your app to the Store and to remove profiler support.
There are three build configurations you can choose from. Debug should obviously be used to debug your scripts. Release optimizes code for better performance. Master configuration build should be used to submit your app to the Store. It has profiler support stripped out.
For more information, see Building and deploying a Unity Visual Studio solution (HoloLens)