Excel Column Header Scrolls from Header within worksheet

I have attached two pictures of a spreadhseet where the header row scrolls into the Excel Column Header row. How do I make this happen? This is not my workbook, but I can't figure out how this was done. Seems simple enough but I'm lost.

In one picture you see the typical excel column header of A, B, C, D etc... and the worksheet header below in row 6. In the next picture I scrolled down one row and the Header moved up to the Excel Column Header.

It has to be so simple, but I can't find where to make that change for the other worksheets in this book.

TIA,
Melanie - many-time user, first-time poster