how to remove project Class code default values?

Summary:

Is there a way for us to remove the default values for the Project Class Category Class code?
We want to remove these default values so that users are required to input the correct or expected values. Most of the time, users allow the system to save with the default values, and we want to prevent that from happening.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):