How do add a page to an specific section (InDesign)?

Hi, I want to add the selected page to the section that starts on the next page (543). I thought I could just drag the little arrow above to the page, but it won't work. Need some help pls

Hi, I want to add the selected page to the section that starts on the next page (543). I thought I could just drag the little arrow above to the page, but it won't work. Need some help pls
On page 542 - add a new page and it should appear after page 542.
543 will now be 544 and should still have the triangle.
To adjust section markers (the little triangle)
This video demonstrates how to work with sections
https://www.youtube.com/watch?v=9KVs37om0BM
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