I want to make the "user.displayName" column to be made public to other logged in users. I know I can write a custom SQL view but I want to stay with Hasura. The only solution is to mimic a guest role and use the public role to expose the displayName. I can do that by removing the "Authorization" header in the Hasura request. How do I do that?

If I understand correctly, you only need to add select permissions to the user role on the auth.users table (only on the display name column)