After inserting the separator, the front and rear parts become different. If "Link to the previous section" is cancelled between the previous section and the next section, the header of the next page will naturally disappear. If the link needs to be the same as the previous header, click Link to Previous on the floating toolbar of the header and footer. If you need to set a new title, just reset the new title.

Generally, if the previous page is an even page and the current page is an odd page, we just need to click Page Layout-Delimiter-to insert the next page from the previous page. When entering a header, be sure to cancel the link to the previous header and edit it again.

When the previous page is an odd page and the current page is an even page, we need to insert a blank page to make the current page an odd page, so we need to change it and choose an odd page in Page Layout-Delimiter-section break.

At this point, it has been completed. When you print the preview, you can see that a blank page appears.