LO envelope prints sideways

LO; MacBook Pro OS 10.11.6; Brother HL2270DW series CUPS.
No matter what I do, my LO 5 envelopes print sideways along left end. On the screen they are exactly what I want. In print preview they are what I want (except envelope is 4" x 8.5") I see others have this problem; solutions haven’t worked for me.
In Print, the LibreOffice print screen does not have any select paper size, or portrait/landscape choice, nor any print button (or it’s below the bottom of the screen, but “zoom out” in View pull-down does not work with LO screens). In other Print screens such as Layout, the select paper size is greyed out. No way for me to specify #10 envelope.
I have tried changing an envelope doc from protrait to landscape, but the text inside the fields does not turn sideways. So that doesn’t help.