Facebook has been popular among its users for decades. Now, the latest update to Facebook UI for desktop is amazing. Facebook not only updated the UI but also have the dark mode option for its users now.
Have a look at the new UI!

Switch to New Facebook
From the top right corner, select dropdown and click on Switch to New Facebook.

Dark Mode
If you like dark mode, there is good news for you on Facebook. Now you can turn on the dark mode and see the dark version of Facebook.
How to enable Dark Mode?
From the top right corner, select the dropdown button.

Now click on the Dark Mode button.

Facebook Announcement
Facebook in its tweet announced to roll out the new UI for everyone in a few months.
Enjoy with new Facebook!
Introducing a fresh, simpler https://t.co/Rw6MBNKIl3.
— Facebook App (@facebookapp) March 19, 2020
This desktop experience will be rolled out to everyone over the next few months. Check out how to opt-in below. pic.twitter.com/r2FBCuBHBl