Growsun Sweater Drying Rack 6-Layer Stackable Mesh Cloth Dry Dyier,White

it says foldable. its not obvious to me how? how much space does it take up when folded?

What is used to keep the raw pole edges from scratching hardwood floors?

Do the rubber foot protectors stay on even when stacked?

Bought this nov 17. still old t's that most are cracked, too heavy to stack. can i buy new stronger t's?