Here’s where you need to be gentle. You’ve worked hard to create air pockets in the dough, and now it’s important not to deflate them.
Lightly flour your work surface and turn the dough out onto it. Gently fold it into a rectangle.
Bring the top edge of the dough down toward the center, then fold the bottom up over the top (like folding a letter). If needed, you can fold in the sides as well.
Flip the dough seam-side down, and gently shape it into a round by cupping your hands around the dough and rotating it in a circular motion.
The goal here is to create surface tension on the top of the dough, which helps it hold its shape during baking. Place your shaped dough into a floured proofing basket or a bowl lined with a floured towel for the final rise.