Tip: A stop-loss isn’t required, but strongly suggested. it is the simplest way to minimize your downside and protect your simulated capital if and when the market does not go your way.
No - a stop-loss is not required on any P1 challenge. Whether and how you protect each position is your decision.
That said, we strongly recommend using one. Your Maximum Daily Loss and Maximum Total Loss are hard limits that end a challenge the moment they are reached, and a stop-loss is the simplest way to stop a single trade from running into them.