Training. Months and months of training to the point that of anything occurs they’ll just switch into calm problem-solving mode.
Ironically I just spent the last 4 hours or more reading through the [annotated transcripts of the Apollo 13 mission](https://www.nasa.gov/history/afj/ap13fj/08day3-problem.html) from the time the oxygen tank blew up to splashdown.
Despite what the 1995 film would have you think, there was almost no drama within the crew and most of the time they were just going back and forth with Mission Control discussing incredibly detailed technical spacecraft systems functions and procedures which would have obviously taken years to become familiar with.
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