Which feature of Real-Time CDP can be utilized to view amalgamation of all the fields...

According to the Adobe documentation2, a union schema is a feature of Real-Time CDP that can be used to view the amalgamation of all the fields contained within multiple schemas sharing the same class. A union schema is automatically generated by the platform and reflects the latest changes in the underlying schemas. A union schema can be used to create segments or explore profiles across different datasets. References: 2 https://experienceleague.adobe.com/docs/experience-platform/profile/home.html?lang=en#union-schemas