Manually change the driver settings

You can manually change these settings back to A4 from the Device Settings tab and on the Advanced Options tab opened from the [Advanced] button on the Kappris Printing Preferences dialog:

Remember these driver property sheets are invisible by default in the Kappris driver; to see them you need to uncomment the line

Show Standard Driver UI=True

in config.ini and then reopen the driver UI from the Printers folder.