Setting [Auto Detect] to ON automatically detects the size of the loaded paper (only for the optional Paper Feed Unit).
Selecting [Custom Size] from the drop-down list allows you to directly enter and specify the length and width of paper. For details, refer to Specifying the custom size.
If you select the paper size category from the drop-down list, the system jumps to the selected category.
When loading custom-sized paper, directly enter the length and width of paper.