If you go into the Styles menu (either the F10 or F11 key, I forgot) you can change the font of the Default Paragraph (or something akin to that name) to the font of your choice.
I haven’t used LibreOffice Writer in a while, though, so I’m not sure if that change will stay between sessions, but it should.
Linux Mint install one of the hull it on the way do i dont trust them om
Complete GIBBERISH brought to you by Heliboard