Months after Facebook confirmed work on Dark Mode for Messenger, its testing begins. It just hit some users from some countries before its official premiere.
At the moment the list of markets where Dark Mode is available is unclear, but it definitely includes the United States. The new feature changes the text to white and the background to black. The colored elements do not change. Also, everything that is light gray is changed to a darker shade.
If any of you has access to this mode, you can turn it on in the appropriate section. However, the function is still unfinished and does not always work. Facebook is working on its completion and soon each of us should have access to it.
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Source: Phonearena