you can disable specific plugins by opening kibana.yml file and adding:
xpack.ml.enabled: false (to disable machine learning)
console.enabled: false (to disable dev tools)
most of the plugins can be disabled this way.
most of those apps are part of our basic license, so starting kibana and elsasticsearch in OSS mode will get rid of most of them:
https://www.elastic.co/downloads/elasticsearch-oss
https://www.elastic.co/downloads/kibana-oss