Place 3 dough balls each on two pieces of parchment paper, then cover them with a clean tea towel.
Do not cover with plastic wrap. This keeps the dough very soft, which is harder to score later on.
Leave the dough balls at room temperature until they have doubled in size and the dough doesn’t feel cold anymore. In my 70 degree F kitchen, dough that had been shaped right away took 2-3 hours to double, while dough that had been in the fridge took at least 4 hours to double in size since the dough was cold.
Do not rush this step - the dough will bake up dense. To test the dough to see if it ready to bake, press a clean finger into the dough. If the dough rises back quickly, it needs longer to proof.
If the dough rises back slowly, leaving a small imprint in the dough, the dough is ready to bake. If the dough does not rise back and the imprint stays, the dough is over proofed.