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.