Select the entire directory, and then press Ctrl+F 1 1 to lock the domain.

You can try. The page number will not change when previewing.

However, in this case, you cannot update the page number. You need to press Ctrl+shift+F 1 1 to unlock it.

In fact, after you preview, the page number becomes the same number, and you don't need to update the page number or save it. You just have to close word, don't save it, and then open it again, and the page number will get better again.