Very lightly dust a work surface with flour and turn the dough over onto the flour using a dough scraper to help you lift it cleanly. The top ‘skin’ side should now be downwards and in contact with the floured work surface and you should have the sticky side facing upwards.
Gently, and without pulling at the dough, fold the bottom third up to the middle like you are folding a letter. Fold in the left edge to the middle and then the right side and finally the top down so all four sides have been folded in, creating a neat parcel.