Insert manual column break in CALC

LO Win 8.1. Scaling to print X Pgs wide times Y Pgs high works well but I have a particular sheet where I’d like to manually modify the page breaks, but I can’t seem to do that. I’ve tried both selecting a column and INSERT-PAGE BREAK-COLUMN as well as VIEW-PAGE BREAK PREVIEW, but neither seems to work (I don’t see my manually created column breaks, I can’t “grab” with a mouse to “move the blue lines” as instructed by the HELP file). Turning off the print scaling doesn’t help (it prints on one page, ignoring my attempt to insert column breaks). I’m not confident enough in my ability with LO to know if this is a bug or I’m just doing something wrong, so PLEASE HELP.

There is an option Menu/Tools/Options/LibreOffice calc/Print - Always apply manual breaks.

Thank you so much for your quick response and CORRECT answer, it’s very much appreciated.