Stopped choice to print in landscape mode.

Using Mac OS 10.14.6. Using HP OfficeJet Pro 8740. Was getting choice for landscape printing prior to printer freezing up. After getting printer to print again, I no longer had the choice to print in landscape mode. HP tried to fix, but could not. Said it would have to be corrected by LibreOffice.

An if HP claims it is a LibreOffice issue then this is a fact? Printer drivers are a piece of software from printer manufacturers and not of application developers. Here we start and it is possible that LibreOffice has a problem with your current printer / driver - the first thing to check: Do other applications provide an option landscape and LibreOffice is the only which doesn’t have that?