Hi Andrew,

I cannot reproduce your problem on my side.

Here is my Page Setup:

The same as yours.

The result is in the attachment.

Maybe something is wrong on your side with paper size you are using? Are you using predefined paper size from printer software or it is custom paper size (with the name "US Letter"), which matches predefined from printer software)?

If you are using predefined paper size from printer, then - have you tried to change paper orientation to "portrait"?

Do you have this issue only in one specific drawing?