I have a Epson L3150
After years of being frustrted with Epson, I finally found the solution. (I’ve tried using the ‘envelope’ setting but it did not solve my problem'.
# open devices and printer
# click on your online printer which you intend to print the document with
# printing preferences
# set Document settings to A4, 2 sided printing : Manual [br]
(if you want to print 4 pages into 1 page: also change your ‘Multipage’ accordingly