I followed the install instructions here. In those instructions it states that after restarting Home Assistant I will see the new configuration- logins: [] anonymous: false customize: active: false folder: mosquitto certfile: fullchain.pem keyfile: privkey.pem require_certificate: false
I just did this yesterday…in theMosquitto AddOn web page (Supervisor) up at the top a tab “Configuration”. There you will see the configuration (all default values shown)
There’s bo file you can edit directly, you edit it through the GUI. The config is then stored in the .storage folder, which you shouldn’t touch, unless you really know what you are doing.