http://sparrowa7io5pz6ud3ehqzosvepbxbxt2zphmkjsylp2zgxooko23pqd.onion/docs/faq.html
Sparrow has a number of command line options, for example to change its home folder or use testnet: Usage: Sparrow [options]
Options:
--dir, -d
Path to Sparrow home folder
--help, -h
Show usage
--level, -l
Set log level
Possible Values: [ERROR, WARN, INFO, DEBUG, TRACE]
--network, -n
Network to use
Possible Values: [mainnet, testnet, regtest, signet]
--terminal, -t
Terminal mode
Default: false
--version, -v
...