I am using an Epson XP-900 which has A5 paper in it and the setting is confirmed as A5.
What I cannot do, which I could on the old version of Excel, is select the print area as A5. Under "Page Layout" I used to be able to select A5 and it would outline the pages with dotted lines. I can highlight what I want to print, and it does show the dotted lines even though A5 is not an option under "Page Layout - Size".
When I print this selection it misses out most of Column A.