Where is the Picard configuration saved?

Picard saves the configuration in the file Picard.ini. Its location depends on the operating system:

Windows:

%APPDATA%\MusicBrainz\Picard.ini

This usually will be C:\Users\YourUserName\AppData\Roaming\MusicBrainz, where YourUserName should be replaced with your actual Windows user name.

macOS, Linux and other Unix like systems:

$HOME/.config/MusicBrainz/Picard.ini