Change the log level on iOS 10 (Unified Logging) with Console.app
Xcode 10.0 beta 6 (likely others too) won’t show debug messages logged from the simulator even after enabling Include Info Messages, Include Debug Messages in the Console.app. AFAIK there is no fix for this.
To see debug logs sent from the simulator you have to stream from a terminal instead:
xcrun simctl spawn booted log stream --debug --predicate 'subsystem == "es.com.jano.Myapp"'