I try to keep my documents as dynamic as possible. I believe that adding text at any point in a document should not hurt the overall layout of the document. There is one problem I keep running into that I just don't know how to fix, even though I feel it should be a built-in functionality so I figured I'd check if anyone knew anything about it.

Word automatically determines where to end text on one page, and start it on the next unless page breaks are inserted. Is there a way to adjust the automatic page end logic?

The most important reason I'm asking this is because Word does not see a heading text followed by a normally formatted text as a whole. Because of this, it's possible that the heading for a new block of text is at the bottom of the page while the text this heading refers to starts on the next.
I want the heading to move to the next page if there is not enough room for text to fit directly below it. How does one go about to achieve this without manually inserting page breaks?