Hi Naddy,
See if you don't want the employee to see the details screen then as Mr.Shankar told you do the settings in the table V_T7XSSPERSUBTY.
Now end user will not be able see the details screen then in case if you wan to customize the communication UIBB displayed in the Personnel profile application then enter transaction SE80->FPM_LIST_UIBB->HRESS_CC_PER_OVR_COMM_DATA_XX(Component configuration).
Do the customization in the above mentioned component configuration as per the requirement.
If you want to do come changes in the details screen i.e when an employee selects change,details icon then check for the FPM_FORM_UIBB_>HRESS_CC_PER_DTL_COMM_DATA_XX(Component configuration).But i think this would not be relevant as you don't want the end user to change or view the details screen.
Regards,
Mithun K