User permissions in Oracle DB

Hi I'm using Oracle 19c database.

I created a new user/schema called MM_UAT and given the required grants. I want the MM_UAT user only to see the DB_OBJECTS of other schemas or specific schema. My required DB_OBJECTS like tables, views, functions and procedures seems OK. but there's a problem. If I right click and open a package like PRODN.PKG_REPORTS and i click "view spec & body", i cannot see the body i see only the specs. I have given extra permissions as well to check if they work:

GRANT EXECUTE ANY PROCEDURE TO MM_UAT;