I have come across this solution for this before but I cannot find it for the life of me today.
How do I get UE4/Xcode to build non-debug versions of targets. Say the editor for instance. It seams no matter what I do it always builds debug.
Product->Build for->Profiling. Or, edit scheme and change the Build Configuration for Run to Development. Please note that if you set it to Development for Run, you will need to browse for the app you built in order to actually run it from Xcode.