UI/UX designers work with both paper-based and digital artifacts but lack tools that seamlessly integrate the two. Mixed Reality (MR) offers under-explored opportunities to combine the strengths of both design environments. To examine these opportunities, we first conducted interviews with 19 professional UI/UX designers to understand their current experiences using paper and digital artifacts. Motivated and informed by the interview insights, we organized nine conceptual-probe user study sessions in which designers engaged with a MR-probe that combined paper and digital prototyping processes and brainstormed MR's potential in UI/UX design. We found that participants valued MR for enabling continuous hybrid design workflows, reducing manual reconstruction, supporting spatially anchored workspaces, and facilitating real-time cross-medium collaboration. They also envisioned future MR tools with AI assistance, richer interactive and dynamic content, and the ability to manage diverse design artifacts within a unified environment. From these findings, we derive four design dimensions for future MR systems that could enable more fluid, creative, and collaborative design practices.

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