I have found a solution , see this post [https://developer.apple.com/forums/thread/742594]
Select the relevant product in the the Scheme dropdown (e.g. "[AppName] Watchkit App", or "[AppName]" for iOS app
Select "Edit Scheme..."
Select "Run" in list on the left
Select "Arguments" tab
Click ">" next to "Environment Variables" to show a (probably empty) list.
Click "+"
In "Name" column, double click the space and enter: IDELogRedirectionPolicy
In "Value" column double click the space and enter: oslogToStdio
Ensure the checkbox is selected
Click Close button.
You have to repeat these steps for each iOS, WatchOS product as each has its own Run Scheme.
Now NSLogs will print to the Debug Console again.