Read More Best Free Way to Recover Deleted/Lost Word/Excel Files Click the drop-down icon to select your desired theme for your Word/Excel app. If you think the dark theme is too dark, you can also choose Dark Gray mode which is lighter than the dark theme. To enable dark mode for Word/Excel, you can choose Black. Under Office Theme in the right window, you can click the drop-down menu and choose your preferred theme.Click File tab at the top-left corner, and click Account option in the left panel.Open Microsoft Word/Excel app or a Word/Excel document.You can freely change your Microsoft Office apps to the preferred background color. How to Make Microsoft Word/Excel Dark Mode The default theme of Office apps is Colorful. However, for Office 2016 or Office 2013, you can only change Word/Excel theme to dark gray, white or colorful. For Microsoft 365 subscribers, it includes these four themes. It offers black, dark gray, white, and colorful themes. Microsoft lets you change the background color of Office apps. To recover deleted or lost Word, Excel, PPT, or any other files for free, you can use MiniTool Power Data Recovery. In this tutorial, you can learn how to enable dark mode in Microsoft Word, Excel, PowerPoint, and Outlook. Microsoft Office apps also have a dark mode.