In earlier versions of LO I could select and print two facing pages (e.g. pages 2 & 3 in a 4-page A5 brochure but this is no longer possible. I’ve just had to make a somewhat traumatic move to Ubuntu 20.04 and this has compounded the trauma 
One of the options that I could uncover gave me the result I wanted. There’s an option to print 2 pages side bu=y side on an A4 which I imagined would do the trick but no, the preview shows that the pages will be printed one below the other, irrespective of which offered option is taken. I have used LibreOffice since the dawn of time…
