Open the Word document.
Go to the page that contains the page break.
Turn on formatting marks: Home tab → ¶ (Show/Hide).
Find the “Page Break” line (it will appear as “Page Break” on the page).
Click immediately before the “Page Break” marker.
Press Delete or Backspace to remove it.
If the page break is hard to select:
Select the text before the break and press Delete/Backspace.
If the page break is created by a section break:
Turn on ¶ (Show/Hide).
Locate “Section Break (Next Page)” or similar.
Click before the section break and press Delete/Backspace.