When activated, this turns all your Office apps from PowerPoint, to Outlook to OneNote, a solid black and is very easy on the eyes especially when you’re working at nighttime. Microsoft’s Office Suite has a built in dark theme that not many people are aware of. You can change nearly all Windows 10 apps to the dark theme via Microsoft’s global dark app setting, for more info look here. While we’ve discussed how to customize the base operating system, and we can link to it here, but many users of Windows 10 spend far more time using apps and the web than they do in the main OS itself. Windows 10 is a versatile and customizable operating system ad allows users to choose how their apps UI looks.