Enable Dark theme on Microsoft Edge browser
The theme will change instantly, and you do not need to restart the browser.
If you use Dark Mode in Windows, it will automatically switch to dark mode, and so on.
Automatically change Microsoft Edge Theme based on time
If you want to automatically enable or disable dark and light themes based on your timezone, then you can use a tool called Windows Auto-Night Mode. You can have a dark theme during the night when you use the computer in the dark, while during day time, you can use the light theme. You can configure the time duration when Windows should use a dark theme and a light theme. If you select Microsoft Edge Theme as System, then it will change as soon as Windows Auto-Night mode changes the system theme. Make sure to run the software as the computer boots up so it can update automatically. Microsoft should add the time-based factor their dark mode as part of the OS. I am sure many would like to have it. I hope the tutorial was easy to follow, and you were able to configure dark or light mode in Microsoft Edge. TIP: This post shows how to how to force Dark Mode on websites using the Edge browser.