Insert the page number in the full text, place the cursor at the end of the document on page 4, and click Page Layout-Delimiter-Next Page (as shown in figure 1). This will insert section break between page 4 and the following pages. The purpose of inserting section break is to make them not affect each other. )

First, select the page number on page 5 and deselect "Link to previous header" under the design menu (as shown in Figure 2). Then select the page number right-click menu on page 5 and set the page number format-select the starting page number and manually fill in "1" (according to your needs: select the format you want. )-ok

Of course, you can delete the page number of 1-4 now, and rest assured that it will not affect the following page number, because it has been separated by section break.

You can ask if you don't understand.