Scrivener will not remember paper size

Hey there, I’m on the latest version of Scrivener and macOS. My document opens in A5 as the paper size and although I can change it to A4 in Scrivener > File > Page setup > Page Attributes > Paper size, the next time I open this document it switched back to A5 again. Is there a way to solve this? Thanks for any suggestions!

Hey sorry, problem solved. Just realised that my ‘default page size’ in system printer & scanner settings is A5. Stupid me!