Hi,
The print feature entirely depends on the kind of printer installed and specifically to the printer that is set to as "Default" printer.
Depending upon the paper sizes supported by the set default printer, the paper size list is generated.
Also, when we have a printer capable of handling the paper size of A0 or A1, we do have an option in the paper setup to select the paper size as "A0 or A1".
Thus, it is recommended to check whether the default printer installed has support for the paper size you want, and also if any of your installed printer is capable of handling the paper size you desire, have it set as "Default" printer type.
For your convenience, I am attaching the snapshot of my paper setup dialog box, which shows the sizes "A0" and "A1"; as my default printer is capable of handling these paper sizes.
Let me know if you shall need any otehr clarifications here.
Thanks and Regards,
Ajeet
PageSetup_741bbb03.zip