I’ve tried the suggestions online but I cannot get the headers to repeat! What am I doing wrong?
i.e. I tried saying " header on" but that had no effect??
Finally, received a good direction:
Format>Print range>edit then Rows to repeat $ (first line number): $(last line number)!!
Should NOT have been that hard to find but it took a bit of research and trial and error.
Open Help, search for print

Format > Print Ranges, Rows to Repeat
See page 256 | Calc Guide 25.2 in the Calc Guide or the LibreOffice Help Edit Print Ranges.