Canon imagePROGRAF iPF825 - Manual (Page 219)

2.
Select the printer, and then display the printer properties dialog box.
3.
Click the Device Settings tab to display the Device Settings sheet.
4.
Select the A Automatically switch paper sources (paper size priority) check box.
5.
Click C Acquire Status.
The paper size information is acquired from the printer, and the width of the roll paper that is actually loaded in the
printer is displayed.
Enhanced Printing Options > Other useful settings >
iPF825 Switching the Paper Source of Roll Paper to Match the Paper Size
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