## 1 Introduction  
In recent years, the limitations of traditional desktop applications in managing digital content have become increasingly apparent, particularly when handling historical records of content revisions. These applications typically generate revision logs, each representing the content's state at specific time points [1,2]. While these tools often provide mechanisms for users to navigate between different states, such as through text [3], thumbnails [4], or miniature 3D models [5], they face challenges in effectively conveying the temporal relationships between content states. As emphasized by [PERSON] [6], these historical tools are crucial in the visualization process, allowing users to view, retrieve, and revisit different states to support iterative analysis. However, the limited screen space on desktop devices often forces these tools to reduce the amount of information they can display, leading to a less intuitive user experience.  
The challenge arises from the need to balance the main task interface, which typically occupies the majority of the screen space, with the graphical history record, often confined to smaller regions [7]. This design trade-off complicates the presentation of semantic information about spatial data, such as 2D views and 3D models, simultaneously. Consequently, users attempting to understand historical states face an increased cognitive load.  
Mixed reality (MR) presents a promising solution by enabling users to interact with virtual content while perceiving the real-world physical environment, offering an intuitive and immersive experience. Researchers have successfully applied 3D visualizations from existing desktop software to physical spaces for analyzing software architecture [8; 9; 10], performance [11; 12], and project management [13]. As MR technology becomes more widely adopted, the distinction between data visualizations displayed on screens and those projected into physical space is increasingly blurring [14]. Studies have demonstrated that 3D representations outperform traditional 2D displays in terms of speed, recall, and reduced cognitive load [9]. Additionally, combining 2D displays with 3D MR environments has been shown to enhance data comprehension [15].  
Building on these advancements, we propose HybridFilm, an innovative historical tool that seamlessly integrates screen space with immersive reality, enabling smooth interoperability between the two environments. By leveraging MR technology, HybridFilm offers a more intuitive and immersive approach to visualizing historical content, reducing cognitive load and enhancing users' ability to comprehend and navigate complex data. The main contributions of this work are as follows:  
1. Establishment of a Multi-Source Spatial Fusion Framework: This framework enhances desktop operations by minimizing the interference of immersive reality components, thus preventing disruptions to user workflows while interacting with desktop applications.
2. Design of a Multi-Source Spatial Historical Data Visualization and Interaction Scheme: Based on the \"focus + context\" model, this design utilizes spatial cognition to facilitate a deeper understanding of historical states and their temporal relationships.
3. Usability and Effectiveness Verification: Building upon the historical tools used in molecular 3D model analysis software, the usability and effectiveness of HybridFilm are validated through practical assessment.