1. Double-click the document you want to set on your computer to open it.

2. After opening the document, click Start at the top of the toolbar.

3. Then find the replacement in the starting directory and click this option.

4. After opening the search and replace window, enter a-z in the search content of the replace window.

5. Then click Format More below and select the font option in the format.

6. After entering the font setting page, find a new Roman font in the western font and select it.

7. Finally, click Replace All in it, so that all the letters can be replaced with new Roman fonts at one time.