If we use word, we can first select "Allow this kind of editing only in this document" in the "Protect Document" window, and then select "Annotate" in its drop-down menu, so that others can only annotate the document and cannot do other operations. If No Changes (Read Only) is selected, no changes can be made. But in the end, you must click "Yes, start compulsory protection" to make the setting take effect. After the above settings, you will find an interesting phenomenon. When we position the mouse in a protected document, many buttons on the formatting toolbar are gray, which indicates that our protection has taken effect.

If we need to edit or modify the document ourselves, we can continue to open the "Tools" menu, select "Unprotect Document", and enter the previously set password in the pop-up window to restore.