Why is the word document in red font and there is a horizontal line in the middle of the word, all of which are red and cannot be modified? How to change it, please

Tools/raw materials

Word20 16, computer.

1, open the computer and click to open the document software of word20 16;

2. Click to open the document software, and edit the modified text content in advance for later demonstration;

3. After editing, find and click the view command in the toolbar above;

4. Click the Revise button at the bottom of the review interface and select the original status to complete the review.