When you add more content than will fit within the document’s top and bottom margins, Word creates a new page by inserting a soft page break. A soft page break produces separate pages in Print Layout view and is displayed as a dotted line in Draft view.
If you want to control how pages break, you can insert a manual page break in one of three ways:
Click Page Break in the Pages group on the Insert tab.
Click Breaks in the Page Setup group on the Page Layout tab, and then click Page.
A manual page break produces separate pages in Print Layout view, and appears as a dotted line with the words Page Break in the middle in Draft view.