People use it to keep in touch with family and friends every day.
One solution to this is Facebook Messenger in Dark mode.
What Is Dark Mode on Messenger?

The other elements in the chat also change slightly.
The Dark mode setting is hidden inside the Preferences menu.
Launch Facebook Messenger desktop.

If you don’t have it installed yet, you candownload Facebook Messenger for desktopand install it first.
grab the smallMessengericon at the upper left of the window, selectMessenger, and selectPreferences.
This will open aPreferenceswindow.

SelectAppearancefrom the left menu, then select theThemedrop-down.
Here you’ll see a selection of different themes.
you might choose any of the darker themes you prefer.

If you prefer a slightly lighter dark mode, theGreytheme is a better option.
If you like high-contrast displays with darker dark and lighter lights, chooseHigh Contrast (Dark).
Once you select theDarktheme, all of the Facebook Messenger windows you have open will update to Dark Mode.

If you ever want to switch back to Light mode, just repeat all of the steps above.
Instead of choosing the Dark theme, choose theLighttheme instead.
This will immediately change all open Facebook Messenger windows back to Light mode.

At the bottom of theFacebook Messengerpanel, selectSee All in Messenger.
This will open theMessengerbrowser app.
In theFacebook Messengerbrowser window, snag the drop-down menu at the upper right corner of the window.

Then selectDisplay & Accessibilityand enable theDark Modetoggle.
This will convert the entire Facebook Messenger internet tool app window over to Dark mode.
Enabling Dark mode in the Facebook Messenger app is just as simple as doing it in the internet tool.

Launch the Facebook Messenger app and tap on yourProfileimage in the upper left corner.
This will bring up theProfilescreen where you’ve got the option to tap to enable theDark Modetoggle.
When you enable this, you’ll see the entire Facebook Messenger window switch over to Dark mode.

It definitely gives Messenger a very different look and feel.