Challenge 1: A Page Break Followed by a Margin Change — Solution Walkthrough

Setup: paragraph 1, a page break (Ctrl+Enter), paragraph 2 on the new
page, then the document's margins are changed (Layout > Margins).

What happens:

BOTH paragraphs are affected identically — paragraph 1 on the first
page and paragraph 2 on the second page both shift to reflect the
new margin settings. There is no difference in how the margin change
applies to content before the page break versus content after it.

Why the page break made no difference:

A page break (Ctrl+Enter) does not create a new section — it only
forces whatever comes after it to start on a fresh page. Margins are
a property of a SECTION, and by default an entire document is just
one single section from start to finish, page breaks or not.
Changing the margins therefore changes them for the one and only
section that exists, which both paragraphs belong to regardless of
which page they happen to be sitting on.

Notes:
- This is the direct, hands-on version of this chapter's own core
  claim: a page break affects WHERE content starts, never WHAT
  formatting applies to it. Only inserting an actual section break
  between the two paragraphs would have made it possible for them to
  end up with genuinely different margins.