Thank you for using the Support Forum. In the driver if you go to printing preferences, select other size under paper. A new window will display labeled Paper Size. Select the down arrow on Original size and the list of sizes will display. Select the size you want to delete so that there is a check mark next to it and then select delete from the drop down list. This process will only delete custom sizes you created. I hope this helps.
Hi, we always print on the Phaser 7800 on different custom page sizes, and we found a problem:
how to delete previous custom page sizes from the system menu?
It's annoying to have a long list of custom page sizes