Kafka incorrect configuration

I'm getting to know Kafka and I wonder how to fix the following:

[thrd:app]: Configuration property sasl.mechanism set to PLAIN but security.protocol is not configured for SASL: recommend setting security.protocol to SASL_SSL or SASL_PLAINTEXT

You can see the configuration in appsettings.json and I'm running the docker-compose.yaml for Kafka.
https://github.com/Hulkstance/kafka-dashboard