Facebook’s new “Dark Mode” feature for Messenger can now be enabled manually on Android and iOS devices.
You can enable Dark Mode on Facebook Messenger by sending a moon emoji in a chat. As soon as users send this emoji, a message at the top pops up that reads “You Found Dark Mode!”.
Once the “Dark Mode” is on, Facebook will display a message saying it’s still working on this feature, so you won’t see “Dark Mode” everywhere in Facebook Messenger. It may also appear broken at some places.