There may be times you have created Headers and/or Footers but they are not showing up on the Preview.
1) You will need to check the first section with the Margin Setup.
In this case the section only has a Footer.
2) The next section you will also check the Margins and these should be set to Footer => All sections equal.
Once all other sections have been updated accordingly but the Headers/Footers are still not showing, the next thing to check is your Cover Page.
When creating a Cover Page they should always be saved under the Category Cover Page. In this instance the Cover Page was created under the Category Letters.
A new cover page will need to be created and saved under the appropriate Category.