I installed Juno yesterday.
VPN Connections in Network setting do not affect on the browsers and in Chrome proxy settings is written:
"When running Google Chrome under a supported desktop environment, the system proxy settings will be used. However, either your system is not supported or there was a problem launching your system configuration. But you can still configure via the command line. Please see man google-chrome-stable for more information on flags and environment variables."
, but they affect the whole system through the terminal.
Software icons are not visible in the system tray.