Set it up as best you can and stake it out with the ropes tight. Move the bottom of the poles inward so you can get the door zipped as much as possible. Over a few hours, the canvas will loosen up & you can move the legs out & tighten the ropes. It might take a good while, but if you keep doing this you should be able to get it back to its original size. My Davis tent shrunk during a 4 day rain storm last month & this is how I got it back to original size & the door zipping shut again. Think of a canvas tent like a pair of jeans. When you take them out of the dryer & put them on, they’re tight, but by the middle of the afternoon, you’re looking for a belt.