If you’ve added section breaks in your document the easiest way to see where they begin and end is to first display all formatting marks:
Click Home > Show/Hide.
The section breaks that you’ve added will start and end with this:
Note: The type of section break shown above is a Continuous section break; there are other kinds and will be labled as such.
To delete, place your cursor just before the section break and press Delete.
Note: When you delete a section break, the text that was above the break becomes part of the section that was below the break—making them one section—and that first section will now take on the properties and formatting of the section that was initially below it.