App.config

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <section name="akka" type="Akka.Configuration.Hocon.AkkaConfigurationSection, Akka"/>
  </configSections>

  <akka>
    <hocon>
      akka {
      stdout-loglevel = DEBUG
      logLevel = DEBUG
      }
    </hocon>
  </akka>
  
  
  
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
    </startup>
</configuration>

Program.cs

 class Program
    {
        static void Main(string[] args) {

            var system = ActorSystem.Create("LoggingTest", ConfigurationFactory.Load());
            Console.WriteLine("System loglevel: "+system.Settings.LogLevel);
            var a = system.ActorOf<LogTestActor>();
            do
            {
                a.Tell("test");
                var s = Console.ReadLine();
                if (s == "stop")
                    break;
            } while (true);
            system.Terminate().Wait();
        }
    }

    public class LogTestActor : ReceiveActor {
        public LogTestActor() {

            Receive<string>(s => {
                
                Console.WriteLine($"DebugEnabled: {Context.GetLogger().IsDebugEnabled}");
                Console.WriteLine($"InfoEnabled: {Context.GetLogger().IsInfoEnabled}");
                Console.WriteLine($"ErrorEnabled: {Context.GetLogger().IsErrorEnabled}");
                Console.WriteLine($"WarningEnabled: {Context.GetLogger().IsWarningEnabled}");
               
                var logger = Context.GetLogger();

                logger.Debug("Debug stuff");
                logger.Info("Info stuff");
                logger.Error("Error stuff");
                logger.Warning("Warning stuff");
            });

        }
    }