During November 2025, Maun Nguyen developed an editor font size customization feature for the toeverything/AFFiNE repository, enabling users to adjust typography in real time through a slider in the editor settings. This solution leveraged React for the user interface and TypeScript for type safety, updating a CSS variable instantly to provide immediate visual feedback. The feature improved accessibility and readability, allowing users to tailor their editing environment to their preferences. Maun collaborated with other contributors through code review and co-authorship, demonstrating proficiency in front end development, real-time UI updates, and the integration of accessibility-focused enhancements into production code.