Expanding the Mobile Drying Rack's Capacity

What happens here

With the mobile drying rack positioned on a flat surface (appearing to be inside a temporary painting booth enclosure made of plastic sheeting), the operator demonstrates its expandable feature. He releases a quick-release locking mechanism on the rack's frame, allowing the upper tiers to extend vertically, significantly increasing the overall height and number of drying slots. He then secures the rack in its expanded position, making it ready to accommodate a larger batch of cabinet doors or other painted items.

Goal: Increase the available drying capacity of the mobile rack.