2) Click the activate button on the odd page to set the header and footer of the odd page in the header and footer settings.
3) As above, set the page text of even pages.
4) If you need to set a different header for each page of even pages, you can start from the second page of even pages, activate the page, select Insert-Delimiter-Continuity, then double-click the activated header, and click the "Same as before" button on the header toolbar to enter the required header and confirm closing.
5) Repeat on the page you need 4) Set the header you need.
In other words, select Insert-Delimiter-Continuity from the page you want to start, then double-click the active header, and click the "Same as before" button on the header toolbar to enter the header you need and confirm that it is closed.
I just experimented, too. It's all designed. There are too many steps in this setting:
1. Menu bar-File-Page Setup-Layout-Header and Footer: Odd pages are different from even pages (tick).
2. Menu bar-View-Header and Footer-(Header and Footer toolbar appears)-Enter the contents of the header of the odd-numbered page (first page), and the following third, fifth and seventh pages are the same by default.
3. Enter what you want in the header on the second page, and then close the Header and Footer toolbar.
4. Place the cursor at the top of the fourth page: menu bar-insert-separator-section break type-continuous.
5. Open the "Header and Footer" toolbar-put the cursor on the header of the fourth page and click "Link to the previous page" (the button is "Two parallel pages"): the "Same as the previous section" in the upper right corner of the page disappears.
6. Enter headers with different contents in the header, and close the header and footer toolbars.
7. If the following even pages need different headers, repeat the operation as above.