It’s a good idea to tick this one if you want to protect the overall look of the document. There are three more options at the bottom for you to choose:
(You can also access this option by going to Review | Restrict Editing.) When you click on this item, the Restrict Editing sidebar will appear on the right-hand side of the document. Truly force ‘Read Only’ document status.
Restrict Editing options let you collaborate on a document more broadly without the risk that important parts will be changed or edits made without a clear reviewing trace. It’s more fine-grained control of what people can do in the document rather than the entire Word document permissions options we’ve mentioned before. There are options in Microsoft Word to limit access a document in different ways.