A family of Microsoft word processing software products for creating web, email, and print documents.
Hi Noi,
The color-switching behavior you're seeing is because the background of your document is black. The color of the ink is changed after you're done writing it to ensure that black ink can be read even though the background is so dark.
In order to see your ink clearly both while you're writing it and after it's done, I recommend temporarily turning the background of your Word document white while you draw.
If the background is dark because you're using Word's Dark Mode, you can switch to a white background by clicking the "Switch Modes" button on the View tab.
If the background is dark because Windows is set to a high contrast theme, then you can switch to a white background by going to the Windows Settings app, clicking the "Ease of Access" button, and selecting the "High contrast" tab on the left. Either use the "Turn on high contrast" toggle to turn the mode off or select a different high contrast theme that renders the background of the Word document white.
Hope this helps,
Heather