Path to the music directory

Mopidy is configured using the mopidy.conf file. Where that file is located depends on how you run Mopidy and this is described in the documentaion at https://docs.mopidy.com/en/latest/config/.

The specific configuration for Mopidy-Local (such as the media_dir setting you want) is described at https://github.com/mopidy/mopidy-local#configuration.

I don’t think any of the Python 3 compatible webclients help you to configure Mopidy.