This section break in Word will not delete

if you can't click into the right spot, switch to View > Draft. the break shows as a plain dotted line across the page and you can click it and delete it much more easily.

turn on the paragraph marks first (the ¶ button on the Home tab) so you can actually see the break, click just before it and press Delete. If it still refuses, check Track Changes is off - with it on, the break just goes red and struck through instead of disappearing. One thing to know: the section before the break takes on the formatting of the section after it. So if one part was landscape or had different margins, the page layout can suddenly change when the break goes. Undo and fix the page setup first if that happens.