Hello Phil, Thanks for reaching out to the Community! To confirm are you referring to printing downloaded invoices from Quickbooks and the sizing for letters? Thanks-Emma
QBO invoices (using the standard templates) are US Letter size = 8.50×11.00in (portrait).
This cannot be altered.
The rest of the world (I'm generalising here - I haven't actually checked!) uses A4 = 210x297mm (portrait). Some reckless types might even want to turn that paper/pdf on its side & go 297x210mm (landscape) - but that's maybe a step too far for now.
The whole invoice template designer needs an overhaul - or, for preference, reinstating the docx template import - but maybe just allowing A4 would be a good start.