What is the ruling of the Shari'ah regarding free mixing of men and women?

Question:
He says: In our country, a system of free mixing of men and women has been imposed on us for boys and girls in Islamic primary schools, which has led to the loss of modesty and covering among the girls as a result of the excessive mixing with the boys. In addition, let alone the other problems of sexual harassment and rape. Is there a command regarding this law that falls under the command to forbid what is wrong, and should we prevent our daughters from studying in these schools?

Answer:
There is no doubt that this action is what is wrong. The action of free mixing of men and women and the causes of trial, discord or temptation between males and females. This is a great evil. And whoever commands it is one who commands what is wrong. It is contrary to the Shari'ah of Allah (Glorified and Exalted is He). As for you, keep your daughters away from these schools, educate them