Override Eligibility - what determines if a Program, Plan or Option is visible?

Summary:

When using the Override Eligibility option against a life event for an employee, for some employees we can see the Program, Plan and Options however for other employee records only the Options are visible to amend.

Content (required):

When using the Override Eligibility action I can select the Plan name, select to make ineligible and all of the options within the Plan become ineligible however for some employees I cannot see the Plan and have to select every Option to make them ineligible.

Why can some records see the Program, Plan and Options and others only see the Options please?