user-defined

This term is primarily used in technical documentation, software engineering, and user interface design. It describes a high degree of flexibility where the system provides a framework, but the specific parameters are left to the discretion of the end-user. It carries a positive connotation of customization and empowerment.

In a professional context, it is often contrasted with terms like "hard-coded," "preset," or "default." While a default setting is the standard provided by the developer, a user-defined setting is a deliberate modification made to suit a specific individual's needs or workflow.