All the created Review Periods are showing to every employee

Summary

All the created Review Periods are showing to every employee

Content

The review periods are created to evaluate permanent employees, probationary and contract employees seperatly. Those review periods must be shown only to the related employee type. But every employee in system is visible to every review period created in the system. The review periods related to contract employees also shows to GM's.

Is there any way that we can restrict this unwanted review periods to employees ?