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Yes, it's true....you should stop turning them on day 18th to let the chicks orient themselves for hatching...it also coincides with the time frame that you raise your humidity levels inside the incubator......and then DO NOT OPEN the incubator until the hatch is complete.
If you do open it, you run the risk of allowing the exposed membranes of a hatching chick to dry out. It essentially dries up around the chick and it cannot struggle free...and it will die. It's what's referred to as "shrink wrapping," and it's not good.
Others with more experience than I have will post more info for you, but we're all probably going to give similar advice.