In office and other text docs or spreadsheets I just set my printer to horizontal and can print.
This is not letting me change.
No OS, LibreOffice version, nor printer make and model. Please see Ask/Getting started.
Is your page set to landscape? Did you check (and/or change) the layout in the Print dialog? What is not letting you change?
Did you click Format > Page, in the dialog that opens select the tab labelled Page and select Landscape?
spreadsheetcommon
It’s fun how inventive people are, when they need to provide a tag corresponding to their application, and instead of choosing “calc” (because they use Calc, right?), they create such a combination 
Actually I just didn’t understand what to put in so in order to move forward, i took my best guess.
OK. Did any of the suggestions or answers help? If ebot answer worked, please click the grey tick beside that answer to change it to green. Else edit your question (click the edit link below your question) or add a comment. Cheers, Al