In order to avoid this situation, we can protect the Word document from being modified, if the formatting of the Word document changes, which can result in the loss of data. How do I protect the formatting of Word documents? The steps are as follows:
First open the Word document you want to protect, click the Tools menu, select Protect Document, so that you can open the Action window on the right.
Select the Restrict formatting to options style item, and click the Settings button to select all the formatting you want to protect in the open formatting Restrictions window, such as preventing changes to headers, footers, and so on, returning to protect documents, and clicking Yes, start the Force Protection button. Set a password in the pop-up window to make the settings effective.