Simply put: divide the text and the previous part into two sections.

The method is as follows:

Step 1: Position the cursor at the end of the previous page of the text, and insert → Delimiter → section break Type: Next Page → OK → If there are extra blank pages, press the Delete key to delete them;

Step 2: Position the cursor on the first page of the text, view → header and footer → change the cursor from header to footer → click "Link to previous page" on the header and footer toolbar → close the header and footer toolbar;

Step 3: Position the cursor on any page in front of the text, and insert → page number → format → number format: select the Roman number format you need → OK;

Step 4: Position the cursor on any page of the text, and insert → page number → format → initial page number: 1 → OK;

Step 5: Double-click the page number → Select the page number → Set the font size → Center.