Can't build UE4.14 in Xcode 8

I’ve gone into build configurations, however the only options available to ShaderCompileWorker are ‘Debug’ and ‘Development’. I went into UE4’s build settings but I can’t find a way to enable the other configurations. Would you know what I need to do here?

This is after changing UE4’s build configuration to Development Editor. I just can’t do the same for ShaderCompileWorker, and attempting to build either still fails.