The first screenshot [id = [’%CurrentUser%]’] is making it so users can only see their own user profile. So when I am logged in to your app and I retrieve a list of users, I will only see myself.
The second screenshot, I can’t see all of the Xpath constraint, but it looks like it is making it so the user can only see their own user role and not others.
So if I have the user role “User” I cannot see other “Administrator” role.
Hope that helps!