Brush 2 baking sheets with olive oil. Generously flour a work surface turn the dough out onto the flour and divide into 4 pieces. Working with one piece at a time, sprinkle some flour on the dough, then fold the top and bottom portions into the middle. Fold in the sides o make a free-form square. Use a spatula to turn the dough over, then tuck the corners to form a ball. Place seam-side down on a prepared baking sheet. Repeat with the remaining dough, putting 2 balls on each baking sheet. Let stand, uncovered, until more than doubled, about 2 hours.