How do I run a 'Debug' in XCode?

I've added some code to the AppDelegate.m file in my React Native app. I hoped this code would be run in the XCode console when I clicked "Build", but it doesn't. However, I did come across this

When I look at the logs from the "Debug" here on 2019-11-21, I do see the output of the code I want to see. I don't know how this Debug was run though. Does anyone know how I can run it again?