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You can read the full official changelog below for more details.
What’s new in Office Insider Build 16.0.14701.20036:
Eagle Eye view: Move seamlessly between your files
Do you find it challenging to move back and forth among open documents in Office Mobile? Now you can use Eagle Eye view to see all your active documents at one time, and move content between them with ease. To activate this view, swipe down from the file header or file name; tap to select the document you want, or tap Home to open a new document.
Dark Mode now available in Android
You asked for it! You now have the option of a “true Dark Mode” experience in Word for Android—turning your document canvas black. This feature can improve the reading experience in dark environments and reduce eye strain for users. To activate Dark Mode, just turn on Dark Mode in your device settings or go to App Settings and turn it on for Word.
If you’re not a part of the Office Insider program, you can join Office Insider for Android by following a few simple steps. You can click on this link for a step by step installation guide.