It didn't. As you see, Tibetans and some Pacific islanders have evolved in the past few thousand years, and we see more recent cases like the Milano mutation, and a mutated myostatin gene. Evolution is going on all around us, and is observable and measurable.
Your fellow YE creationist (Dr. Kurt Wise) presented many such in his paper Toward a Creationist Understanding of Transitional Forms. DNA analysis, showing the same family tree of living things as first discovered hundreds of years ago by Linnaeus.
There's a huge number of evolutionary predictions that have been confirmed, such as the demonstration that dinosaur heme is more like that of birds than like that of other reptiles.
The huge numbers of predicted transitional fossils discovered after the predictions is compelling, but even more compelling is the fact that we never see a transitional where evolutionary theory says it shouldn't be.