You can connect to an HTTP or SOCKS proxy (for using Wire in a company network or through Tor or I2P) by using the following parameter when starting the desktop application:
--proxy-server="http://localhost:9050"
or
--proxy-server="socks5://localhost:9050"
The hostname and port depend on your proxy server settings.
Be aware that some features like calling might not work or lower the anonymity of Tor or I2P.