Why didn't the Yuan Dynasty force Han people to shave their hair and change clothes? Did the Yuan Dynasty allow Han Chinese to enter Mongolia?

Because there was no custom of shaving your head and leaving a braid in the Yuan Dynasty, there was this custom in the Qing Dynasty. The Mongols conquered the Han family with real knives and guns, ranking fourth in the world, while the Han people and southerners were the lowest, so the clothes were naturally low-grade goods. In a word, Mongols don't like Hanfu at all, thinking it's an inferior dress.