Microsoft recently announced the global availability of Windows 10 May 2020 Update aka Windows 10 Version 2004.
Since its release, users around the globe are reporting on a lot of issues on a variety of topics like audio, graphics and etc.
The latest issue to hit applies to Windows 10 Education, version 2004.
People using the Education build of Windows 10 (version 2004) are seeing black-screen on an external display when working with Office apps with drawing capabilities such as MS WORD, Whiteboard etc.
Microsoft has acknowledged the issue and has provided a workaround until the permanent solution is provided in a future software update.
If you have a device running Windows 10 version 2004 with a built-in screen (such as a laptop or tablet) and a connected external display set to Duplicate your primary screen, you might see both monitors flicker and the external monitor go black if you try to draw using an Office app (such as Word). This can also happen with some other apps capable of drawing, such as Whiteboard. If you check in Device Manager, your graphics controller will have a warning icon next to it (a yellow triangle with an exclamation mark in it).support.microsoft.com
For now, the easiest fix to get around the issue is to simply restart the external device to recover properly.
Let us know in the comments below whether you have encountered such an error so far.