The Logger's logLevel can be configured indiviually for classes, packages and general level.
Levels are "all", "none", "trace", "debug", "info", "warn", "error" and "fatal".

For individual class and package levels, see the system browser's "Debug" - "Log Level for..." menu entries.

The general level is set via the launcher's "Tools" - "Debugging" menu, or via the command line argument "--logLeveL" or programatically with "Logger logLevel:'xxx'".