Go your titles line in Column A and click on WindowsFreeze panes.
If you also want to continue to see Column A as you scroll to the right
you can use WindowsFreeze panes in Column B idea.

"Line on top" wrote:

How do I define a line to appear on top, regardless of scrolling down?
I simply need that the "title" (top) line will remain in my view while
scrolling down.