Hello, we do have a thread here about Dorico users, where the Default Paper Size switches to A4 even if they are living in the US.
Mmh, I have the opposite problem: Living in Europe, we use the DIN Standard, so I switch the Default paper size type from Automatic to International, assuming it must be DIN A4:
As application Language I have selected English.
Strange though, in Print Mode „US Letter“ is showing up under Page Setup:
So I manually change Paper Size to A4 here, before doing further tasks. Most of the time I save as PDF. Still even here I switch to A4 first, to be on the safe side… My HP LaserJet printer is btw configured to have A4 as Standard.