You can limit the types of changes other users are allowed to make in your document by limiting the formatting choices or determining the type of editing you allow in a document you share. On the the Review tab, in the Protect group, use the Restrict Editing tool to choose the restrictions that you want to add to your documents.
Open the document for which you want to restrict editing.
Click the Review tab.
Click the Protect arrow.
Choose Restrict Editing.
The Restrict Editing task pane appears along the right side of your document window.
To limit the formatting others can do in your document, select the Formatting Restrictions check box.
To control the type of edits other users can make, ...