The paper introduces Blended Whiteboard, a Mixed Reality (MR) system designed for remote collaboration on physical whiteboards. The system aims to blend the physicality of real whiteboards with the reconfigurability of virtual whiteboards, allowing users to collaborate across distributed spaces while maintaining a sense of physical presence. Key features include: 1. **Dynamic F-formations**: Users can switch between side-by-side and face-to-face formations, facilitating different collaboration styles. 2. **Dual-Mode Navigation**: The whiteboard can be navigated either through a shared canvas or individual viewports, supporting both joint and independent work. 3. **Reversible Transitions**: Users can easily revert to previous configurations, preserving the physical scale and distance between avatars. The paper discusses the tension between physicality and reconfigurability, highlighting how these principles are applied to support communication, coordination, and cooperation in collaborative tasks. A user study is conducted to evaluate the system's effectiveness and user experience, focusing on the pros and cons of different configurations and transitions. The results show that while side-by-side formations offer natural communication and coordination, face-to-face formations provide a more immersive and collaborative experience. The study also highlights the importance of reversible transitions to maintain a sense of physicality during reconfiguration.The paper introduces Blended Whiteboard, a Mixed Reality (MR) system designed for remote collaboration on physical whiteboards. The system aims to blend the physicality of real whiteboards with the reconfigurability of virtual whiteboards, allowing users to collaborate across distributed spaces while maintaining a sense of physical presence. Key features include: 1. **Dynamic F-formations**: Users can switch between side-by-side and face-to-face formations, facilitating different collaboration styles. 2. **Dual-Mode Navigation**: The whiteboard can be navigated either through a shared canvas or individual viewports, supporting both joint and independent work. 3. **Reversible Transitions**: Users can easily revert to previous configurations, preserving the physical scale and distance between avatars. The paper discusses the tension between physicality and reconfigurability, highlighting how these principles are applied to support communication, coordination, and cooperation in collaborative tasks. A user study is conducted to evaluate the system's effectiveness and user experience, focusing on the pros and cons of different configurations and transitions. The results show that while side-by-side formations offer natural communication and coordination, face-to-face formations provide a more immersive and collaborative experience. The study also highlights the importance of reversible transitions to maintain a sense of physicality during reconfiguration.