A more thorough explanation:

Legal centralism is a theory that suggests that legal systems created by the state are the most important and control other normative systems, such as family or business networks, that define appropriate behavior and social relationships.

For example, in some countries, the government has strict laws about how businesses should operate. These laws are the center of legal life and control how businesses behave. The family or business networks must follow these laws to operate legally.

Another example is how the government has laws about marriage and divorce. These laws are the center of legal life and control how families behave. The family must follow these laws to have a legal marriage or divorce.

Overall, legal centralism means that the state's legal systems are the most important and control other normative systems.