I guess what you want is to enable the readback protection.
I don't know of any way to do this in SEGGER Embedded Studio other than add it to your code.
That means writing to the UICR, more specific the APPROTECT register.
Take a look at this answer.
Another way to enable readback protection, is using nrfjprog.
You can use the command; nrfjprog --rbp ALL
You can also enable the readback protection in nRFgo Studio.
Hope that helps. Let me know if you have any more questions.
Best regards,
Joakim.
