UGR setup of hiding fields in PA30

Hi Team,

There was some scenario I observed before in some project that (not sure how the full setup happened) for PA30 tcode as below.

we as admins cannot see some critical fields of other members (like for example, salary information or data of birth) though we have PA30 tcode because we are assigned with UGR parameter in SU01 and with some value.

Like the same way, we have a requirement that, users should not update some field on their own record for some info type and they should be able to see (at least or update) those for other employees in PA30.

May i know how this is possible and any steps for this?

Thank you,