"Settings" option vanished from Mac

Hi

The "settings" option via "advanced" has vanished from my main Mac computer and laptop. It means I cannot go to the bit to "change channel". It still exists on my ipad, however, via "settings" and "advanced settings" but not on my Mac. In fact, ever since the update to Sonos that turned the interface black, under "manage" at the top, all I now have is "music library settings", "service settings" and "add radio station".