A family of Microsoft word processing software products for creating web, email, and print documents.
Master Pages in Word's Pub files do not work as they do in a desktop publishing program because it's still a Word document under the hood & Word is not a desktop publishing program. The concept of a page is a visual imposition, not a physical reality in the structure of the document. Creating a new Master is essentially the equivalent of inserting a Section Break (Next Page) in a regular Word file. Any "pages" in the same section must share the same Master. However...
Within the section there is actually a separate Master for each page in that section. Unless you specify differently, anything you put on any of that section's Masters will appear on every Master & every page in the section. The Different First Page option enables you to have exactly that - a first page in the section which is different from the other pages in that section. IOW, based on what you describe wanting, there is no need for a second Master. To get what you're looking for you need to have 2 pages to start with so you have 2 instances of the Master, then...
- Use the Different First Page checkbox,
- Put the "big header" on the first master in the section,
- Put the "small header" on the other instance of the same Master
The result is that the 1st page will have the "big header" but the 2nd page on will have the "small header". Further, note the blue line in the Thumbnails Pane which falls somewhere between 2 of the pages in the document as you currently have it set up. Any pages above the line share the 1st Master while any pages below the line share the 2nd Master.
Regards,
Bob J.