How to choose the policy tree of the fifth order of civilization

First of all, you should choose an ideology, including freedom, dictatorship and order. Each player can only choose one ideology. There is one in the lower left corner of the policy tree: switch to ideology, and you can start two first-levelism, two second-levelism, one third-levelism and one ism. As for the cultural value of a policy, you can't say that the policy space can't be suppressed. You don't know what this means. Allow the policy to remain unchanged. Is this option unchecked? You must have a policy before you can open it.