Canon LBP7018C E-Manual page 147

IMPORTANT
When loading envelopes
See "Printing on Envelopes" and load the paper in the correct orientation.
NOTE
When loading paper with a letterhead or logo
See "Paper Loading
4
Align the paper guides with the loaded paper.
You can slide both sides of the paper guides by holding the lock release lever (A).
IMPORTANT
Be sure to align the paper guides with the paper.
If the paper guides are too loose or too tight, this may result in misfeeds or paper jams.
5
Make sure that the paper stack is loaded under the load limit guides (A) and the hooks (B) on the
Orientation" and load the paper in the correct orientation.
from Short Edge] in the [Paper Source] sheet in the printer driver
when printing.
(Printing speed drops by loading paper in portrait orientation when
printing on plain paper.)