Microsoft is still making improvements to the Dark Mode experience in Windows 11, and this newest update to the Dev Channel ...
The classic Run utility finally gets dark mode with Windows 11 KB5067103 update in Beta and Dev Insiders channel.
To turn on dark mode in Outlook, click the File tab, choose Office Account, and set the Office Theme to black.
To turn on dark mode in Windows 10, head to your computer's "Personalization" menu, which will let you change most of your PC's visuals.