Process Hacker 2 : How to avoid storing strings on memory during code scan

Question

We have developed WPF application and we have created the individual config file for the environment. In each config file, we have the data with encrypted format and we used to decrypted the data whenever we need it from the application.

But when we used to run process hacker tool is capturing all the data as plain text. Not sure is there any way we can keep the confidential info and read it proper way, which process hacker will not capture during the code scan.