In LibreOffice Calc how do I change print orientation

I want to print in landscape orientation. Printer is set for landscape, but spreadsheet prints in portrait orientation

Have you tried menu File → Print → General tab → Properties → select Landscape ?

On my version (6.1.5.2) the Print Preview still shows portrait orientation but the printed page is actually landscape after using the above.

(Addendum) See also the answer to this question

The question is answered in the comment.