How did the Qing alter those policies?

After 1683 the Qing rulers turned their attention to consolidating control over their frontiers. Taiwan became part of the empire, and military expeditions against perceived threats in north and west Asia created the largest empire China has ever known. From the late 17th to the early 18th century, Qing armies destroyed the Oirat empire based in Dzungaria and incorporated into the empire the region around the Koko Nor (Qinghai Hu, “Blue Lake”) in Central Asia. In order to check Mongol power, a Chinese garrison and a resident official were posted in Lhasa, the centre of the Dge-lugs-pa (Yellow Hat) sect of Buddhism that was influential among Mongols as well as Tibetans. By the mid-18th century the land on both sides of the Tien Shan range as far west as Lake Balkhash had been annexed and renamed Xinjiang (“New Dominion”).