Worked on the CherryHQ/cherry-studio repository to address a focused UI bug affecting the horizontal multi-model message layout. Using React and CSS, implemented a targeted adjustment that ensures the inner content area scrolls vertically while the outer card remains fixed, improving the user experience for long multi-model responses. The solution involved regression testing and manual verification to confirm stability across edge cases, including horizontal group scrolling and various layout types. JavaScript and TypeScript were used to maintain compatibility and code clarity. Documented the fix with clear release notes, ensuring no upgrade impact and facilitating future contributions and audits for the project.