I do not know if this will solve your issue after keyboard changes. But I've been having to change printer properties every time I print, from A4 defaults, and finally think I have fixed it.
To change the printer defaults, you have to be in Control Panel, Devices and Printers. Right click and select -->Printing Preferences. Adjust the Paper size to Letter, then click the button -->Default. Click apply. The settings on the default printer seem to now have picked up on the other printers (Windows 10.)
(As a matter of reference, I am in Canada, not Europe, and A4 keeps showing up)