This video will show you how to set the dark theme in Microsoft Teams
(for Windows 10/8/7).
1. To begin, launch Microsoft Teams on your desktop or in your browser.
Log in to your account if you haven’t already done so.
2. Now, click on three dots in the top-right corner of the window and
select Settings.
3. Click General in the left sidebar, then click Dark on the right.
4. Microsoft Teams will immediately turn darker without any prompts.
In the future, if you ever need to disable dark mode, click Default on
the same screen where you chose Dark. This will enable the default light
theme.