Hi, from the CLI app, you would need to set the sync target to the file system with:
:config sync.target 2
Then you can specify the directory where the files should go with:
:config sync.2.path /path/to/synced/dir/
Currently there's no config screen to do this in the desktop app, but it's possible to enable by changing the settings directly in the SQLite database (in the "settings" table).