Word prints large white margins (left and bottom)

For some reason, my A4 sized printouts that are supposed to have standard 1 margins, come out scaled smaller and moved to the top right of the printed A4 sheet. The printer involved is a Brother DCP-L3510CDW which has been operating properly for several years. The laptop used (Win10) is about half a year old and until maybe a month ago did not have this issue. The Brother iPrint Scan software is fully updated (12.0.3.2). The current workaround is creating a PDF (which always prints as intended). I therefore suspect there's an unusual problem with my word documents themselves. How do I get rid

Question by MiG on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.