Visualization role does not show me data

Summary

I have created a view-only role for contracts but when assigning it to a user it does not show information

Content

Good morning community,

I ask the following question in order to find the best guidance in this regard:

I have created a custom role for viewing only, however when I assign the role to a specific user it does not show me information, in this regard I would like to know if I should add any specific function in the security policies of functions or in the data security policy, Someone could explain to me or indicate a document where I can find the clearest possible explanation of the role played by each policy.