Design started with research into the capabilities of the evaluation board to understand the business needs.
Feedback from initial prototypes indicated that it was better to hide advanced board controls initially. A clean, simple interface that showed standard metrics and an animation when a device was attached helped make the software seem more approachable.
An advanced control screen was developed to allow fine-grain control over the board's behavior, and more detailed metrics and graphs, but kept the general representation of the board and its connections.
The first designs were simple paper prototypes used to help gather feedback from potential customers.
To help customers evaluate products, they're grouped together on evaluation boards that potential customers can test. In the past the hardware tests were done using scopes and probes, but a better user experience is to provide software to help manipulate the board's settings, and show its capabilities. In this case, the board had two USB-C connectors on it, and was designed for use in cars.
A starting point: competitor's evaluation software. Complex and difficult to use.
USB Evaluation Software