This paper is focused on the UI/UX aspects of the graphical learning design authoring tool GAmified LEarning Design Editor (GALEDE). GALEDE is designed to help educators create gamification-based flipped learning scenarios. It is built as a model-driven approach leveraging the capabilities of the Eclipse Sirius platform and Obeo Designer. It addresses the challenge of designing these learning scenarios by offering an intuitive interface that simplifies the design process. The functionalities and features of the tool provide various levels of user guidance and assistance. Moreover, the paper includes an evaluation that involves educators from different domains. Results highlighted its strengths. The latter involves an easy-to-use interface, rich support for gamification elements, and customisation. Improvement areas that lead to upcoming enhancements are also identified. These insights address GALEDE’s potential as a valuable tool for designing gamified flipped learning scenarios.