Word's cursor becomes a black rectangle and a small black square. How to save it?

The specific steps of recovery are as follows:

The materials to be prepared are: computer and Word document.

1. First open the Word document to be edited and enter the editing page.

2. Then click "Rewrite" in the lower left corner of the Word document page to change to "Insert" mode.

3. Then you can see that the mouse cursor in the Word document is restored to its original appearance.