Developed a targeted user experience improvement for the JetBrains/intellij-community repository by implementing explicit bookmarks tree expansion in SplitMode. Focused on enhancing accessibility and reducing user confusion, the work streamlined split-view workflows by ensuring the bookmarks tree reliably expands when needed. The feature was delivered as a single, well-documented commit, demonstrating careful attention to code clarity and maintainability. Utilized Kotlin for both UI development and software engineering tasks, adhering closely to repository standards and providing clear inline documentation to support future maintenance. No bugs were addressed during this period, with all efforts concentrated on delivering this focused feature enhancement.