Empty per_person_secured_list_v and per_assignment_secured_list_v

Summary:

I have admin profile but secured views are empty.

Content (please ensure you mask any confidential information):

I have admin profile but the following queries return no result, why?

select * from per_person_secured_list_v

select * from per_assignment_secured_list_v

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):