I went into System | Administration | Printing, which uses gnome-cups-manager and deleted my printers. I then edited /etc/papersize. That file had a single line A4, which I changed to Letter.
I reinstalled my printer using the gnome-cups-manager. My printer is actually connected to another computer. I installed a PPD file from the manufacturer (Brother). Now, most apps print to Letter size paper, but Evolution still uses A4. I installed a PDF printer and when Evolution prints to it, it also prints A4 size.
I went into System | Administration | Printing, which uses gnome-cups-manager and deleted my printers. I then edited /etc/papersize. That file had a single line A4, which I changed to Letter.
I reinstalled my printer using the gnome-cups-manager. My printer is actually connected to another computer. I installed a PPD file from the manufacturer (Brother). Now, most apps print to Letter size paper, but Evolution still uses A4. I installed a PDF printer and when Evolution prints to it, it also prints A4 size.