You can also call up this dialog by double-clicking in the Ruler. You want to make sure that you are making the settings the same in the two sections. Likewise, you need to copy the content of the headers or footers. Once you have them the same, if there is no reason for the section break, you can delete the section break. (When you delete a section break, the settings of the section past the section break become the settings for the earlier text.)

Experiment with a copy of your document. Once you have it like you want it, you can save the document under the original name.

It will make editing easier if you display non-printing formatting marks. Showing non-printing formatting marks in Microsoft Word