Mixed realities, based on technologies like Augmented Reality (AR) and Virtual Reality (VR), are becoming increasingly accessible, enabling individuals to immerse themselves in different realities more easily. However, these technologies are not fully integrated into everyday life yet. Even when they are, not everyone may want full immersion, and some individuals may need to remain in the physical world. Additionally, practical constraints, such as having only one headset available for multiple people, may limit immersion to one person at a time, but this does not prevent users from necessitating to communicate with each other while immersed in different realities. This need can be satisfied thanks to Cross-Reality (CR), a concept which refers to interactions and transitions between different realities, such as the virtual and the real, i.e., physical world.