In the case of other administrator except the user ID 1, you cannot see the Advanced Security Settings to set the Encrypt Personal Data On Database. It is because the option is important to maintain the BioStar 2 and affects to the communication and DB encryption.
Please log in BioStar 2 with the user ID 1 which is the first generated administrator while you install BioStar 2.
1) Confirm the login ID and password of the user ID 1.
2) Enter the admin and password of the admin.
3) Go to settings>Security> and confirm if the admin user can see Advanced Security Settings.