Unlicensed Product and activation errors in Office
If Office activation fails, you'll see Unlicensed Product or Non-commercial use / Unlicensed Product in the title bar of your Office apps, and most features of Office are disabled. To restore all features of Office, you'll need to fix the problem that's causing activation to fail.

Allow changes to parts of a protected document - Microsoft Support
You can mark a document as read-only and still allow changes to selected parts. You can make these unrestricted parts available for anyone who opens the document, or you can grant permission to specific individuals so that only they can change the unrestricted parts of the document.

Video: Clear formatting - Microsoft Support
How to undo the last formatting change or clear all formatting of text or images.

Dictate your documents in Word - Microsoft Support
Dictation lets you use speech-to-text to author content in Microsoft 365 with a microphone and reliable internet connection. It's a quick and easy way to get your thoughts out, create drafts or outlines, and capture notes.

Apply sensitivity labels to your files and email - Microsoft Support
The sensitivity bar makes it easy for you to see what label is applied to your file, and to apply or change a label whenever you need to, including when saving the file. Just select the sensitivity bar in the save dialog to see the labeling options for this file.

Sensitivity labels are automatically applied or recommended for your ...
Microsoft 365 can be configured to recommend or automatically apply a sensitivity label to a file or email if it includes sensitive corporate or personal information, such as social security numbers, credit card numbers, or bank account numbers.