Canon varioPRINT 135 Series Operation Manual page 73

Adjust the Size of the optional Bulk Tray for small Format
5.
Use the socket wrench to tighten the bolts.
6.
Close the tray.
7.
Change the media size for the selected bulk tray. [System] -> [Setup] -> [Local key operator
settings] (under [Advanced]) -> [System settings] -> [Bulk tray 1 media size] or [Bulk tray 2 media
size].
8. In the [Trays] view on the control panel, assign the new media to the bulk tray.
72 Chapter 5 - Media Handling
Canon varioPRINT 135 Series