A canopy or tentâ€™s fabric top length can be constructed in a single piece or a sectional top that is expandable to any desired length.
The tent width is the measurement from side to side. This is the 'short side' of the tent and is not expandable.
The length of a tent is the measurement of the tent from end to end. This is the 'long side' or the side where expansion may occur when applicable.
This video demonstrates the differences between a 1 piece and sectional canopy or tent top.