1. Click Review, Protect Document, Restrict Format and Edit:

2. Select the text without square brackets, and then in the dialog box on the right, under "Editing restrictions", select "Only allow such editing in documents:?

3. Select "Fill in Form" in the "Only this kind of editing is allowed in the document" drop-down menu, and then click "Yes:?" in the pop-up deletion format prompt.

4. For text shading, you can directly click "No Color" in the "Shading" drop-down menu under "Start, Paragraph".

5. Uncheck "Allow this kind of editing only in documents", and then save the document.