Node-RED "flows" page Search needs help

I am trying due diligence to find things on my own. "flows" Tab on the main page, I was searching "MQTT broker" which actually pulls up nothing as a result. I found by sheer luck searching "MQTT" I found " node-red-contrib-mqtt-broker".

Can you also, or perhaps by option search comment text. I cannot tell from the titles on these nodes what they do. Can you? How do you do it? one at a time reading all the comments?