Do kings and queens make the laws in a monarchy?

It depends on the nature of the monarchy.

In Absolute Monarchies (like Saudi Arabia or Oman), the royalty do make the laws. In a Constitutional Monarchy with a strong monarch (like Morocco or Jordan), the royalty have a strong hand in law creation, but the legislature plays a significant role in finessing of the legislation. In a Constitutional Monarchy with a weak monarch (like the United Kingdom or Spain), the royalty are largely absent or prohibited from law promulgation.