The problem this solves
When a spreadsheet is long enough to print across several pages, only the very first page carries the column headers by default. Anyone reading page four of a printed report has no way to tell what each column means without flipping back to page one. Print Titles fixes this at the source -- once a header row is set to repeat, every subsequent printed page automatically includes it, without needing to manually copy header text anywhere.
Rows vs. columns
Print Titles has two matching fields: one for rows to repeat at the top, and one for columns to repeat at the left. A wide spreadsheet that prints across multiple pages left-to-right has the same problem in reverse -- the leftmost identifying column (like a name or ID) only appears on the first page horizontally. Filling in both fields together solves the header problem in both directions for spreadsheets that are both long and wide.
Frequently Asked Questions
Does this change what's shown on screen, or only what prints?
Only printing. Print Titles has no effect on how the spreadsheet looks on screen -- it strictly controls what repeats on physical or PDF-printed pages.
Can I select more than one header row to repeat?
Yes, you can drag to select a range of several adjacent rows in the 'Rows to repeat at top' field, and all of them will repeat together at the top of every page.