Abstract: A portable and collapsible canopy structure, capable of being set-up and locked in a set-up condition, and likewise unlocked and collapsed from the set-up condition to a collapsed condition for transportation and storage, comprises a lever system allowing for single-user operation for set-up and break-down, wherein the user remains outside the unit, preferably at a single corner of the canopy frame. Further, the lever system provides means for locking the frame in the set-up condition for safe use, and likewise unlocking the frame for collapsing the canopy structure for transport and storage. More particularly, a lever member engages with a rib linkage associated with one corner of the frame to extend said rib linkage to an extended condition, the extension of which coordinates simultaneous extension of the other rib linkages, as well as extension of horizontal supports connected between the corners of the canopy frame.