Challenge 2: Editing a Header That Reaches Both Before and After — Solution Walkthrough

Setup: pages 1-3 and pages 5-6 both use "Default Page Style"; page 4
uses "Landscape" in between. The header is edited while the cursor is
on page 6.

What happens to the header on pages 1-3:

It changes too — identically to whatever was just edited on page 6.
Since pages 1-3 and pages 5-6 all share the exact same Page Style
("Default Page Style"), and a Page Style's header is a single, shared
definition belonging to that style itself, editing the header from
ANY page using that style updates it everywhere that style is used,
regardless of whether those pages come before or after the page you
were actually editing from.

Why this differs from Word's Link to Previous behaviour:

In Word, turning off Link to Previous for a LATER section makes that
section's header independent of the section before it — but the
relationship is inherently directional: editing a later, unlinked
section's header has no effect on an earlier section's header, since
they're genuinely separate, independently-stored header definitions
at that point. In Writer, "Default Page Style" is not two separate
things before and after the Landscape interruption — it is the SAME
single named style used in both places, with one shared header
definition. There is no "earlier" or "later" version of that header
to keep independent; editing it from page 6 and editing it from page
1 both modify the exact same underlying definition.

WHY THIS WORKS AS AN ANSWER
------------------------------
This is precisely this chapter's own warning box: the propagation
direction is fundamentally different between the two apps. Word's
model is directional (affects "from here forward" once unlinked);
Writer's model is really about which NAMED STYLE a page belongs to,
and every page sharing that name shares its header, regardless of
position in the document.